Volkswagen Diagnostic Trouble Codes

"A" Camshaft Position Actuator Circuit (Bank 1)

• Volkswagen Golf • 2006-2024

On Volkswagen engines the bank 1 intake camshaft adjustment valve is called N205. Check this valve and its…

Intake Camshaft Position - Timing Over-Retarded (Bank 1)

• VW Golf 2.0 TSI (EA888) • 2008-2014

If this code appears together with P0016, inspect the timing chain and its tensioner as well as the sensor or…

Throttle Position Sensor/Switch A Circuit Range/Performance Problem

• Volkswagen Golf • 2005-2020 (Mk5/Mk6/Mk7, 1.4 TSI EA111/EA211)

Carbon build-up on the throttle plate from crankcase (PCV) oil vapour can upset the throttle reading on the…

Throttle/Pedal Position Sensor/Switch A Circuit Low Input

• Volkswagen Golf • 2003-2012 (Mk5/Mk6)

A replacement throttle body needs a basic-settings adaptation.

Throttle/Pedal Position Sensor/Switch A Circuit High Input

• VW Golf • 2004-2015 (Mk5/Mk6)

On the Golf, check the throttle body connector and wiring for damage or corrosion before replacing the…

Engine Oil Temperature Sensor

• Volkswagen Golf • 2005-2024

Inspect the plug and the harness before buying a sensor.

Engine Oil Temperature Sensor Range/Performance

• Volkswagen Golf • 2005-2024

Volkswagen Group cars use a combined oil level and oil temperature sender called G266, which bolts into the…

Engine Overspeed Condition

• Volkswagen Golf • 2003-2024

The Golf has had the DSG dual-clutch gearbox since the Mk4 R32 in 2003. Check DSG mechatronic codes if the…

Knock Sensor 1 Circuit Malfunction (Bank 1 or Single Sensor)

• Volkswagen Golf • 2005-2014

2.0 TFSI (BPY, CCTA) and 1.4 TSI engines. The 2.0 has two knock sensors; P0325 (VAG fault 16709) refers to…

Knock Sensor 1 Circuit Low Input (Bank 1 or Single Sensor)

• Volkswagen Golf • 2005-2024

On the Golf, P0327 is a low-signal fault on knock sensor 1. Check the sensor's wiring and connector before…

Glow Plug / Heater Circuit "A" Malfunction

• Volkswagen Golf TDI • 2003-2020 (Mk5 to Mk7, TDI)

On the Golf TDI, P0380 points to the glow plug circuit: the control module, a glow plug or the wiring. Glow…

Vehicle Speed Sensor "A" Malfunction

• Volkswagen Golf • 2003-2024

Vehicle Speed Sensor "A" Range/Performance

• Volkswagen Golf • 2003-2024

Flex the sensor harness by hand while watching live wheel speed data, because a break that only opens under…

Vehicle Speed Sensor "A" Circuit Low Input

• Volkswagen Golf • 2003-2013

On the Mk5 and Mk6 Golf, P0502 is usually set by a wheel speed sensor circuit shorted to ground. Inspect the…

Vehicle Speed Sensor "A" Intermittent/Erratic/High

• Volkswagen Golf • 2003-2024

Inspect the wheel speed sensor wiring for chafing and the connector for water before replacing a sensor.

Brake Switch "A"/"B" Correlation

• Volkswagen Golf • 2003-2024

Engine Oil Pressure Sensor/Switch Circuit Malfunction

• Volkswagen Golf • 2009-2015

The 2.0 TSI (EA888 Gen2/Gen3) uses a two-stage oil pressure system with two oil pressure switches at the oil…

Engine Oil Pressure Sensor/Switch Range/Performance

• VW Golf 2.0 TSI • 2009-2020

From the EA888 Gen2 onward, the 2.0 TSI switches its oil pump between two pressure stages with the oil…

System Voltage Low

• Volkswagen Golf • 2003-2024

Test the overrunning alternator pulley and the drive belt before replacing the alternator.

Brake Switch "A" Circuit

• Volkswagen Golf • 2004-2020

On Volkswagen group cars the fault text for this code is "Brake Light Switch (F): Implausible Signal"…

Serial Communication Link Malfunction

• Volkswagen Golf • 2004-2024

Check the scuttle and pollen filter housing drains for blockages, and check the battery, since the engine…

ECM/PCM Processor Fault

• Volkswagen Golf • 2004-2024

A replacement requires immobiliser adaptation, which a VW specialist or dealer can handle.

Glow Plug Control Module Circuit

• Volkswagen Golf TDI • 2005-2021

On the Golf TDI, confirm power and ground at the glow plug control module before ordering one.

Cylinder 1 Glow Plug Circuit

• Volkswagen Golf TDI • 2005-2021

The VW fault text for the cylinder 1 glow plug circuit (Q10) lists the glow plug, its wiring and connectors…

Cylinder 2 Glow Plug Circuit

• Volkswagen Golf TDI • 2005-2021

VAG diesels report each glow plug separately. Ross-Tech's entry for VAG's own glow plug fault (P161B) lists a…

Cylinder 3 Glow Plug Circuit

• Volkswagen Golf TDI • 2005-2021

VAG diesels report each glow plug separately. Ross-Tech's entry for VAG's own glow plug fault (P161C) lists a…

Cylinder 4 Glow Plug Circuit

• Volkswagen Golf TDI • 2005-2021

On Volkswagen TDI engines, Ross-Tech's description of the matching cylinder 4 glow plug fault names the plug…

ECM/PCM Power Relay Control Circuit/Open

• VW Jetta 2.5 (North American market) and City Golf • 2005-2007

Ross-Tech's wiki ties P0685 to a faulty ECM relay (J271) or a voltage supply problem to the engine computer…

Intake Manifold Runner Control Circuit/Open (Bank 1)

• Volkswagen Golf • 2004-2024

P2008 means an open circuit in the intake manifold runner control, the actuator that moves flaps inside the…

Lost Communication With ECM/PCM 'A'

• VW Golf Mk5/Mk6 (1.9 TDI, 2.0 TSI) • 2004-2013

VAG equivalents are stored as 'no communication with engine control module' in the CAN gateway (J533). Check…

Lost Communication With Anti-Lock Brake System (ABS) Control Module

• Volkswagen Golf • 2010-2016 (Mk6/Mk7, 1.4 TSI and 2.0 TDI)

On VAG cars U0121 typically points to the ABS control unit (J104) losing CAN drivetrain communication.

"A" Camshaft Position - Timing Over-Advanced or System Performance (Bank 1)

• Volkswagen Golf • 2008-2013

The Golf VI (2008-2013) was sold with the chain-driven 1.4 TSI in 122 PS (CAXA) and 160 PS (CAVD) versions…

Camshaft Position B - Timing Over-Advanced or System Performance (Bank 1)

• Volkswagen Golf • 2009-2012

The Mk6 Golf (2009-2012) was sold with the 1.4 TSI (CAXA, CAVD) and, in the GTI, the 2.0 TSI of the EA888…

"B" Camshaft Position - Timing Over-Retarded (Bank 1)

• Volkswagen Golf • 2006-2024

"A" Camshaft Position - Timing Over-Advanced or System Performance (Bank 2)

• Volkswagen Touareg • 2006-2018

P0021 on a Touareg needs a V-shaped engine, which in the petrol range means the 3.6 VR6 FSI (2007-2018) or…

"A" Camshaft Position - Timing Retarded (Bank 2)

• Volkswagen Touareg • 2006-2014

Bank 2 exists only on V engines. The first-generation Touareg offered a 4.2 V8 FSI (2006-2010), and the…

HO2S Heater Control Circuit (Bank 1 Sensor 1)

• Volkswagen Golf (FSI/TSI) • 2004-2024

Volkswagen Group diagnostic software lists P0030 as fault 16414, "Oxygen (Lambda) Sensor Heating Circuit: B1…

HO2S Heater Control Circuit (Bank 1 Sensor 2)

• Volkswagen Golf (FSI/TSI) • 2004-2024

Volkswagen Group diagnostic software lists P0036 as fault 16420, "Oxygen (Lambda) Sensor B1 S2: Heating…

HO2S Heater Resistance (Bank 2 Sensor 2)

• Volkswagen Passat B6 (3.2 VR6 FSI) • 2005-2010

The B6 Passat was sold with a 3.2 VR6 FSI (engine code AXZ), which has two cylinder banks and so a bank 2…

Intake Air Temperature Sensor 2 Circuit High

• Volkswagen Golf • 2007-2024

On many turbocharged engines the charge air temperature element is built into the charge pressure sensor, so…

Manifold Absolute Pressure/Barometric Pressure Circuit

• Volkswagen Golf • 1998-2024

Volkswagen Group diagnostic software reports P0105 as fault 16489, Manifold / Barometric Pressure Sensor…

Manifold Absolute Pressure/Barometric Pressure Circuit Low

• Volkswagen Golf • 2005-2024

VCDS reports P0107 as fault 16491, manifold absolute pressure sensor G71 or barometric pressure sensor F96…

Manifold Absolute Pressure/Barometric Pressure Circuit High

• Volkswagen Golf (VW Group petrol and diesel engines with sensor G71) • 2005-2024

VW Group engine computers report P0108 as fault 16492, intake manifold pressure sensor G71 or barometric…

Intake Air Temperature Sensor 1 Circuit High

• Volkswagen Golf • 2005-2024

VW calls the intake air temperature sensor G42; that is a component designation, not a part number. On many…

O2 Sensor Circuit Malfunction (Bank 1 Sensor 1)

• Volkswagen Golf • 2005-2024

On VW group cars VCDS shows P0130 as 16514, 'Oxygen (Lambda) Sensor B1 S1: Malfunction in Circuit', and the…

O2 Sensor Circuit Low Voltage (Bank 1 Sensor 1)

• Volkswagen Golf • 2005-2024

Check whether your Golf's engine uses a wideband (air-fuel ratio) upstream sensor or a narrowband one before…

O2 Sensor Circuit Slow Response (Bank 1 Sensor 1)

• Volkswagen Golf • 2005-2024

On VW group cars VCDS shows P0133 as 16517, 'Oxygen (Lambda) Sensor B1 S1: Response too Slow'. Besides an…

Oxygen Sensor Circuit No Activity Detected (Bank 1, Sensor 1)

• Volkswagen Golf • 2004-2014

Inspect the connector shell as well as the sensor.

O2 Sensor Heater Circuit Malfunction (Bank 1, Sensor 1)

• Volkswagen Golf • 2005-2024

O2 Sensor Circuit Malfunction (Bank 1, Sensor 2)

• Volkswagen Golf • 2009-2024

The first-generation EA888 2.0 litre engine had higher than normal oil consumption, seen mostly in…

O2 Sensor Circuit Low Voltage (Bank 1, Sensor 2)

• Volkswagen Golf • 2009-2024

The first-generation EA888 2.0 litre engine had higher than normal oil consumption, seen mostly in…

O2 Sensor Circuit High Voltage (Bank 1, Sensor 2)

• Volkswagen Golf • 2007-2024

On EA888 TSI engines a leaking injector can cause a real rich condition that triggers P0138, so check fuel…

O2 Sensor Circuit Slow Response (Bank 1, Sensor 2)

• Volkswagen Golf • 2005-2024

A slow downstream sensor can come from an ageing sensor, an exhaust leak near it or damaged wiring, so check…

O2 Sensor Circuit No Activity Detected (Bank 1, Sensor 2)

• Volkswagen Golf • 2009-2024

The first-generation EA888 2.0 litre engine had higher than normal oil consumption, seen mostly in…

O2 Sensor Heater Circuit Malfunction (Bank 1, Sensor 2)

• Volkswagen Golf • 2005-2024

P0141 is a fault in the heater circuit of the sensor after the catalytic converter. The heater brings the…

Exhaust Gas Recirculation Flow Malfunction

• Volkswagen Golf • 2003-2024

Ross-Tech lists the EGR valve, its wiring and connectors, and the EGR system as a whole as the possible…

Exhaust Gas Recirculation (EGR) Flow Insufficient

• Volkswagen Golf • 2005-2024

Exhaust Gas Recirculation Flow Excessive Detected

• Volkswagen Golf • 2009-2024

Golf TDI models with the EA189 and its successor, the EA288, build carbon at the EGR valve seat, and a valve…

Exhaust Gas Recirculation Control Circuit Malfunction

• Volkswagen Golf • 2009-2024

Engine covered (diesel): 2.0 TDI of the Golf. P0403 reports a fault in the circuit that controls the EGR…

Exhaust Gas Recirculation Control Circuit Range/Performance

• Volkswagen Golf • 2009-2024

On Golf TDIs with the EA189 and EA288 engines, a P0404 usually means the EGR valve is coked with deposits…

Exhaust Gas Recirculation Sensor "A" Circuit Low

• Volkswagen Golf • 2009-2024

On a TDI Golf the code refers to the position sensor of the EGR valve, so read its live value with VCDS and…

Exhaust Gas Recirculation Sensor "A" Circuit High

• Volkswagen Golf • 2009-2024

On a TDI Golf, check that the EGR valve connector is fully clicked in and the wiring is undamaged before…

Exhaust Gas Recirculation Sensor "B" Circuit Low

• Volkswagen Golf • 2013-2024

The EA288 TDI in the Golf 7 and later uses two EGR circuits: a conventional high-pressure EGR valve and a…

Exhaust Gas Recirculation Sensor "B" Circuit High

• Volkswagen Golf • 2013-2024

The EA288 TDI in the Golf 7 and later uses two EGR circuits: a conventional high-pressure EGR valve and a…

Secondary Air Injection System Malfunction

• Volkswagen Golf • 2003-2024

Secondary Air Injection System Incorrect Flow Detected

• Volkswagen Golf • 2003-2024

VW group fault documentation for P0411 lists the secondary air pump (V101) and its relay (J299), the solenoid…

Catalyst System Efficiency Below Threshold (Bank 1)

• Volkswagen Golf • 2005-2024

Warm Up Catalyst Efficiency Below Threshold (Bank 1)

• Volkswagen Golf • 2005-2024

On a Golf, P0421 refers to the bank 1 catalyst. Compare the upstream and downstream oxygen sensor readings in…

Main Catalyst Efficiency Below Threshold (Bank 1)

• Volkswagen Golf • 2005-2024

On a Golf, check for misfire codes and for an exhaust leak ahead of the catalyst before replacing it.

Catalyst System Efficiency Below Threshold (Bank 2)

• Volkswagen Golf • 1999-2008

Most Golfs have a four-cylinder engine with one cylinder bank, so a Bank 2 code is not expected on them. The…

Warm Up Catalyst Efficiency Below Threshold (Bank 2)

• Volkswagen Touareg • 2006-2018

P0431 can set on the V6 and V8 Touareg (3.6 FSI VR6, 3.0 TFSI V6, 4.2 FSI V8), which all have a Bank 2…

Main Catalyst Efficiency Below Threshold (Bank 2)

• Volkswagen Touareg • 2006-2018

The VW Touareg with the 3.6 VR6 FSI or 4.2 V8 FSI petrol engines can set P0432 at high mileage when the Bank…

Heated Catalyst Temperature Below Threshold (Bank 2)

• Volkswagen Touareg • 2019-2024

The Touareg's V6 and V8 engines have two cylinder banks, so a Bank 2 catalyst code can apply to them.

Exhaust Pressure Sensor "A" Circuit

• Volkswagen Golf TDI • 2009-2014

On Volkswagen group common-rail TDIs this code points at exhaust pressure sensor 1 (G450), which is the DPF…

Exhaust Pressure Sensor "A" Circuit Range/Performance

• Volkswagen Golf TDI • 2009-2014

On Volkswagen group common-rail TDIs, Volkswagen's text for this code is an implausible signal from exhaust…

Exhaust Pressure Sensor "A" Circuit Low

• Volkswagen Golf TDI • 2009-2014

On Volkswagen group common-rail TDIs this code points at exhaust pressure sensor 1 (G450), which is the DPF…

Exhaust Pressure Sensor "A" Circuit High

• Volkswagen Golf TDI • 2009-2014

On Volkswagen group common-rail TDIs this code points at exhaust pressure sensor 1 (G450), which is the DPF…

Exhaust Gas Temperature Sensor Circuit (Bank 1 Sensor 1)

• Volkswagen Golf 2.0 TDI • 2009-2014

On the common-rail 2.0 TDI, Volkswagen calls this part exhaust gas temperature sensor 1 (G235). It is…

Exhaust Gas Temperature Sensor Circuit Low (Bank 1 Sensor 1)

• Volkswagen Golf 2.0 TDI • 2009-2014
• Volkswagen Touareg 3.0 TDI • 2011-2016

Exhaust Gas Temperature Sensor Circuit High (Bank 1 Sensor 1)

• Volkswagen Golf 2.0 TDI • 2009-2014

On the common-rail 2.0 TDI, Volkswagen calls this part exhaust gas temperature sensor 1 (G235). It is…

NOx Adsorber Efficiency Below Threshold (Bank 1)

• Volkswagen Golf 2.0 TDI (EA288) • 2014-2020

A German reference page on the EA288 diesel says its Euro 6 versions use either a NOx storage catalyst or an…

Diesel Particulate Filter Efficiency Below Threshold (Bank 1)

• Volkswagen Golf TDI • 2005-2024

VW group diesels use P2002 more broadly than some other makes: VW group fault-code documentation for this…

Exhaust Gas Temperature Sensor Circuit High (Bank 1 Sensor 2)

• Volkswagen Golf 2.0 TDI (CBEA, CJAA) • 2009-2014

A parts guide for the 2009 to 2014 Golf, Jetta and Beetle TDI with the CBEA or CJAA engine lists four exhaust…

Post Catalyst Fuel Trim System Too Lean Bank 1

• Volkswagen Golf • 2013-2020

Engine covered (petrol): 2.0 TSI (EA888) of the Golf GTI Mk7. No model-specific cause is documented for this…

O2 Sensor Signal Biased/Stuck Lean (Bank 1, Sensor 1)

• Volkswagen Golf • 2005-2024

NOx Sensor Circuit (Bank 1)

• Volkswagen Golf 2.0 TDI (EA288, SCR) • 2014-2020

A German workshop article lists the Euro 6 EA288 2.0 TDI with AdBlue (Golf 7, Passat B8, Tiguan, Octavia and…

Intake Air System Leak

• Volkswagen Golf 2.0 TSI (EA888 Gen 2) • 2008-2014

On the 2.0 TSI (EA888 Gen 2) in the Golf, pull the oil filler cap with the engine idling. If the cap is…

Diesel Particulate Filter Restriction - Ash Accumulation (Bank 1)

• Volkswagen Crafter 2.5 TDI • 2006-2016

Volkswagen's text for this code is "Diesel Particulate Filter (Bank 1): Restricted/Clogged", so on Volkswagen…

Diesel Particulate Filter Differential Pressure Too Low (Bank 1)

• Volkswagen Passat TDI • 2008-2024

On the Passat 2.0 TDI (EA189 and EA288), the pressure across the filter is measured by exhaust pressure…

Diesel Particulate Filter Differential Pressure Too High (Bank 1)

• Volkswagen Passat TDI • 2008-2024

On the Passat 2.0 TDI (EA189 and EA288), the pressure across the filter is measured by exhaust pressure…

Diesel Particulate Filter Pressure Sensor "A" Circuit

• Volkswagen Golf TDI • 2006-2019

On Volkswagen group TDIs the DPF differential pressure sensor is listed as exhaust pressure sensor 1 (G450)…

Diesel Particulate Filter Pressure Sensor "A" Circuit Range/Performance

• Volkswagen Golf TDI • 2006-2019

Volkswagen's own text for this code is an implausible signal from exhaust pressure sensor 1 (G450), and its…

Diesel Particulate Filter Pressure Sensor "A" Circuit Low

• Volkswagen Golf TDI • 2006-2019

On Volkswagen group TDIs the DPF differential pressure sensor is exhaust pressure sensor 1 (G450), and…

Diesel Particulate Filter Pressure Sensor "A" Circuit High

• Volkswagen Golf TDI • 2006-2019

On Volkswagen group TDIs the DPF differential pressure sensor is exhaust pressure sensor 1 (G450), and…

Diesel Particulate Filter Restriction: Soot Accumulation (Bank 1)

• Volkswagen Golf TDI • 2009-2020
• Volkswagen Transporter T6 2.0 TDI (EA288) • 2015-2019

Exhaust Gas Temperature Sensor Circuit Range/Performance (Bank 1 Sensor 4)

• Volkswagen Touareg 3.0 TDI • 2011-2016

The 3.0 TDI V6 in the Touareg has four exhaust gas temperature sensors, and Volkswagen's own location…

Crankshaft Position - Camshaft Position Correlation (Bank 1 Sensor A)

• Volkswagen Golf • 2005-2024

The VW EA888 2.0 TSI/TFSI drives its camshafts with a chain, and early generation 1 engines had camshaft…

Crankshaft Position - Camshaft Position Correlation (Bank 1 Sensor B)

• Volkswagen Touareg • 2004-2018

The Touareg was sold with 3.0 V6 TDI engines in the first generation (7L, 2004-2010) and the second (7P…

Crankshaft Position - Camshaft Position Correlation (Bank 2 Sensor A)

• Volkswagen Touareg • 2004-2018

The Touareg V6 engines (3.0 TDI in the 7L, 2004-2010, and the 7P, 2010-2018, plus the supercharged 3.0 petrol…

Crankshaft Position - Camshaft Position Correlation (Bank 2 Sensor B)

• Volkswagen Touareg • 2004-2024

On the 3.0 TDI V6, read the camshaft correlation data and check the oil level before replacing parts.

Ignition/Distributor Engine Speed Input Circuit No Signal

• Volkswagen Tiguan • 2007-2018

Volkswagen Group software reports P0322 as "Engine Speed Sensor (G28): No Signal", and Ross-Tech notes that…

Knock Sensor 1 Circuit High Input (Bank 1 or Single Sensor)

• Volkswagen Golf • 2005-2024

If the code appeared after intake manifold work, check the knock sensor harness for a pinched wire.

Crankshaft Position Sensor "A" Circuit Malfunction

• Volkswagen Golf • 2003-2024

Camshaft Position Sensor Circuit Malfunction

• Volkswagen Golf • 2005-2024

Camshaft Position Sensor "A" Circuit Range/Performance

• Volkswagen Golf • 2006-2024

Ross-Tech lists P0341 as camshaft position sensor G40, implausible signal, with the wiring, the sensor…

Camshaft Position Sensor "A" Circuit Low Input (Bank 1 or Single Sensor)

• Volkswagen Golf • 2008-2024

Camshaft Position Sensor "A" Circuit High Input (Bank 1 or Single Sensor)

• Volkswagen Golf • 2008-2024

Camshaft Position Sensor "A" Circuit Intermittent (Bank 1 or Single Sensor)

• Volkswagen Golf • 2008-2024

Volkswagen Group software reports P0344 as "Camshaft Position Sensor (G40): Intermittent", so G40 is the part…

Ignition Coil A Primary/Secondary Circuit Malfunction

• VW Golf • 2004-2008

Engines covered (petrol): 1.4 TSI, 2.0 TFSI. P0351 reports a fault in the circuit of ignition coil A.

Ignition Coil B Primary/Secondary Circuit Malfunction

• VW Golf Mk5/Mk6 • 2006-2014

Several coil versions exist, so check the part number against your engine code when replacing the coil.

Ignition Coil C Primary/Secondary Circuit Malfunction

• Volkswagen Golf • 2004-2013 (Golf GTI Mk5 and Mk6, 2.0 TFSI/TSI turbo petrol)

The Golf GTI uses a direct-injection 2.0 litre turbo petrol engine (EA113 in the Mk5 GTI). Direct-injection…

Ignition Coil D Primary/Secondary Circuit Malfunction

• VW Golf • 2006-2016

On a four-cylinder TSI or TFSI Golf, P0354 is the ignition coil on cylinder 4.

Turbocharger/Supercharger Boost Control "A" Circuit Range/Performance

• Volkswagen Golf • 2009-2024

On the common-rail 2.0 TDI the variable-geometry turbo is moved by a vacuum actuator fed through the N75…

Fuel Rail/System Pressure - Too Low

• Volkswagen Golf • 2005-2024

The 2.0 TDI (CR) diesel engines commonly trigger P0087 due to fuel filter contamination or high-pressure pump…

Fuel Rail/System Pressure - Too High

• Volkswagen Golf • 2009-2024

Volkswagen's guidance for this code names three parts: the rail pressure sensor (G247), the fuel pressure…

Fuel Pressure Regulator 1 Control Circuit

• Volkswagen Golf (Mk6, common-rail TDI) • 2008-2013

The Mk6 Golf's 1.6 and 2.0 TDI are common-rail EA189 engines. Ross-Tech's Volkswagen fault text for this code…

Mass or Volume Air Flow Circuit Malfunction

• Volkswagen Golf • 1997-2024

On VW group cars VCDS shows P0100 as 16484, 'Mass Air Flow Sensor (G70): Supply Voltage', so start with the…

Mass Air Flow Sensor Range/Performance

• Volkswagen Golf • 2008-2013

On the Golf Mk6 2.0 TSI (EA888), inspect the intake ducts and the charge pipe for cracks, and check the…

Mass or Volume Air Flow Circuit Low Input

• Volkswagen Golf • 2008-2024

On Golf engines that use a Bosch hot-film MAF (VW designation G70), P0102 is a low-signal circuit fault, so…

Mass or Volume Air Flow Circuit High Input

• Volkswagen Golf • 2008-2024

VW documentation calls the MAF sensor G70, and its fault text for P0103 lists wiring or connection faults (a…

Mass or Volume Air Flow Circuit Intermittent

• Volkswagen Golf • 1997-2024

On VW group cars VCDS shows P0104 as 16488, 'Mass Air Flow Sensor (G70): Intermittent'. The listed causes are…

System Too Lean (Bank 1)

• Volkswagen Golf • 2008-2013

On the Golf Mk6 2.0 TSI (EA888), look for air leaking in after the MAF sensor: the charge pipe and its…

System Too Rich (Bank 1)

• Volkswagen Golf • 2005-2024

Check the purge valve and intake plumbing before suspecting injectors.

Fuel Trim Malfunction (Bank 2)

• Volkswagen Touareg • 2006-2018

On the Touareg 3.6 VR6 FSI and 4.2 V8 FSI petrol engines, P0173 can come from Bank 2 lambda sensor ageing or…

System Too Lean (Bank 2)

• Volkswagen Golf • 2005-2024

Standard TSI and TFSI Golf models are inline-four and single-bank, so they do not set P0174.

System Too Rich (Bank 2)

• Volkswagen Touareg • 2010-2014

On the Touareg Hybrid, which has the supercharged 3.0 V6 TSI, P0175 refers to bank 2 of the V6.

Fuel Temperature Sensor "A" Circuit High

• Volkswagen Golf TDI (common rail) • 2009-2020

VW Group TDI engines label the fuel temperature sensor G81, and VCDS reports this fault as 16567/P0183, Fuel…

Fuel Rail Pressure Sensor Circuit Range/Performance

• Volkswagen Golf • 2005-2024

On VW group cars this code refers to the fuel pressure sensor G247. Ross-Tech lists a low fuel level, a…

Fuel Rail Pressure Sensor "A" Circuit High

• Volkswagen Golf (TSI petrol and common-rail TDI) • 2009-2024

VW Group engines call the rail pressure sensor G247, and VCDS shows this fault as 16577/P0193, Fuel Rail…

Injector Circuit / Open - Cylinder 1

• Volkswagen Golf • 2004-2024

On the Golf, P0201 is a circuit code, so check the cylinder 1 injector connector and wiring first. On a TDI…

Injector Circuit / Open - Cylinder 2

• Volkswagen Golf • 2004-2024

On common-rail TDI engines, the correction code (IMA) of a new injector must be written into the engine…

Injector Circuit / Open - Cylinder 3

• Volkswagen Golf • 2004-2024

On common-rail TDI engines, the correction code (IMA) of a new injector must be written into the engine…

Injector Circuit / Open - Cylinder 4

• Volkswagen Golf • 2004-2024

On TDI Golfs a replacement common-rail injector has to be programmed to the car with a diagnostic tool, which…

Injector Circuit / Open - Cylinder 5

• Volkswagen Golf • 2005-2013

Only five- and six-cylinder engines have a cylinder 5. In the Golf Mk5 and Mk6 these are the 3.2 VR6 of the…

Injector Circuit / Open - Cylinder 6

• Volkswagen Golf • 1999-2005

Standard four-cylinder Golfs do not have a cylinder 6, so P0206 only applies to the six-cylinder versions…

Turbocharger/Supercharger "A" Overboost Condition

• Volkswagen Golf • 2005-2024

Only turbocharged Golfs can set this code, such as the 1.4 TSI and the 2.0 TSI in the GTI and the Golf R.

Turbocharger/Supercharger Boost Sensor "A" Circuit Range/Performance

• Volkswagen Golf GTI 2.0 TSI • 2009-2014

On the first-generation EA888 2.0 TSI (engine codes CCTA and CBFA, used in the Golf GTI and other VW group…

Turbocharger/Supercharger Boost Sensor "A" Circuit High

• Volkswagen Golf GTI 2.0 TSI • 2009-2014

On the first-generation EA888 2.0 TSI VW logs this fault against the boost sensor G31 as signal too high…

Turbocharger/Supercharger "A" Underboost Condition

• Volkswagen Golf • 2005-2024

Idle Air Control System RPM Lower Than Expected

• Volkswagen Golf • 1998-2010

The Mk4 Golf 1.8T has no separate idle air control valve. The cable-throttle AGU engine controls idle with a…

Idle Air Control System RPM Higher Than Expected

• Volkswagen Golf • 2005-2024

VW TSI engines use electronic throttle and are prone to carbon buildup on the throttle body due to direct…

Intake Manifold Runner Control Stuck Open (Bank 1)

• Volkswagen Golf • 2004-2024

Some VW Group engines used in the Golf have flaps in the intake manifold; the 2.0 TFSI (EA888), for example…

Intake Manifold Runner Control Stuck Closed (Bank 1)

• Volkswagen Golf • 2004-2024

Check the intake manifold flaps and their linkage for carbon build-up before replacing the manifold.

Intake Manifold Runner Position Sensor/Switch Circuit Range/Performance (Bank 1)

• Volkswagen Golf • 2008-2014

Golfs with the 2.0 TDI common-rail engine (for example CBAB) are among the cars where P2015 is well…

System Too Lean at Idle (Bank 1)

• Volkswagen Golf • 2005-2024

On the 2.0 TFSI engines BPY, CCTA and CBFA, Ross-Tech points to the crankcase ventilation: on the BPY, a…

System Too Rich at Idle (Bank 1)

• Volkswagen Golf • 2005-2024

Turbocharger/Supercharger Boost System Performance

• Volkswagen Golf • 2009-2024

Volkswagen's text for this code is "Turbo/Super Charger Boost System: Performance". Its listed causes are…

Turbocharger Boost Control Position Sensor "A" Circuit Range/Performance

• Volkswagen Golf • 2013-2020

Volkswagen's text for this code is "Turbocharger Boost Control Position Sensor Circuit: Implausible Signal"…

Engine Coolant Temperature (ECT) Circuit

• Volkswagen Golf • 2005-2024

Check the sensor body and its retaining clip for cracks and coolant seepage before replacing the sensor.

Engine Coolant Temperature (ECT) Circuit Range / Performance

• Volkswagen Golf • 2005-2024

A coolant temperature sensor that is out of calibration can set P0116, so the live reading is worth comparing…

Engine Coolant Temperature (ECT) Circuit Low

• Volkswagen Golf • 2005-2024

Engine Coolant Temperature (ECT) Circuit High

• Volkswagen Golf • 2005-2024

Coolant Thermostat Below Regulating Temperature

• Volkswagen Golf • 2005-2024

Some engines use an electronically controlled (map) thermostat that the ECU opens on command; if it sticks…

Cooling Fan 1 Control Circuit Malfunction

• VW Golf • 2006-2014

On many Mk5 and Mk6 Golfs the radiator fan control unit (J293) is built into the larger of the two fans and…

Random/Multiple Cylinder Misfire Detected

• Volkswagen Golf • 2005-2024

On the direct-injection EA888 2.0T in GTI and R models, carbon buildup on the intake valves chokes airflow…

Cylinder 1 Misfire Detected

• Volkswagen Golf • 2005-2024

On EA888 2.0 TSI and 1.4 TSI engines, carbon buildup on the cylinder-1 intake valve is a frequent misfire…

Cylinder 3 Misfire Detected

• Volkswagen Golf • 2009-2020

The 2009-2020 Golf GTI uses the EA888 2.0 TSI, a direct-injection engine. With direct injection no fuel…

Cylinder 5 Misfire Detected

• VW Golf R32 3.2L VR6 (BUB) • 2005-2008

The 3.2-litre VR6 (BUB) is a narrow-angle six-cylinder with one cylinder head shared by both banks. A quick…

Single Cylinder Misfire (Cylinder not Specified)

• Volkswagen Golf • 2005-2024

VW group diagnostic software shows a misfire recognition counter for each cylinder in the engine computer's…

Evaporative Emission Control System Malfunction

• Volkswagen Golf • 2003-2009

On the Golf Mk5 the purge valve (N80, called the activated charcoal filter solenoid valve 1 in VW's manual)…

Evaporative Emission System: Incorrect Purge Flow

• Volkswagen Golf • 2005-2024

VW documentation lists the purge regulator valve N80, the purge solenoid valve N115, a faulty canister seal…

Evaporative Emission System Leak Detected (Small Leak)

• Volkswagen Golf • 2003-2024

On Golfs with leak-detection hardware, a sticking N80 purge valve can trigger P0442, and the EVAP hoses…

Evaporative Emission Control System Purge Control Valve Circuit Open

• Volkswagen Golf • 2005-2024

VW calls the purge valve N80, and VCDS reports this code on petrol Golfs as EVAP Purge Control Valve (N80)…

Evaporative Emission System Vent Control Circuit

• Volkswagen Golf • 2005-2024

On Golfs with North American-style leak-detection hardware, the N80 purge valve and the vent valve at the…

Evaporative Emission Control System Vent Control Circuit Open

• Volkswagen Golf • 2005-2024

On Golfs with leak-detection hardware, the vent valve is fitted at the charcoal canister near the rear axle…

Evaporative Emission Control System Vent Control Circuit Shorted

• Volkswagen Golf • 2005-2024

On Golfs with leak-detection hardware, the vent valve harness runs along the underbody and is exposed to road…

Evaporative Emission Control System Vent Valve/Solenoid Circuit Malfunction

• Volkswagen Golf • 2005-2024

On Golfs with leak-detection hardware, P0449 usually traces to the vent valve at the charcoal canister or its…

Evaporative Emission Control System Pressure Sensor Intermittent

• Volkswagen Golf • 2005-2024

European-market Mk5 and Mk6 Golfs are built to EU on-board diagnostic rules, which only require the purge…

Evaporative Emission System Leak Detected (Large Leak)

• Volkswagen Polo • 2005-2024

Evaporative Emission System: Very Small Leak

• Volkswagen Golf • 2005-2024

On Golfs with leak-detection hardware, a weeping N80 purge valve is a known P0456 trigger: it can pass an…

Evaporative Emission Control System Leak Detected (Fuel Cap Loose/Off)

• Volkswagen Golf • 2005-2024

The Golf fuel cap must be turned until it clicks, and a cap left short of the click after refuelling is the…

Evaporative Emission System: High Purge Flow

• Volkswagen Golf • 2005-2024

Transmission Control System Malfunction

• Volkswagen Golf • 2003-2024

Golfs with the DQ200 (7-speed dry DSG) and DQ250 (6-speed wet DSG) set P0700 when the mechatronic unit stores…

Transmission Range Sensor Circuit Malfunction (PRNDL Input)

• VW Golf • 2003-2008

On the Mk5 Golf with the 6-speed Aisin 09G automatic, the range sensor is the multifunction switch F125 on…

Input/Turbine Speed Sensor Circuit Malfunction

• Volkswagen Golf • 2003-2024

VW's DSG gearboxes include the DQ200 (dry clutch, 7-speed) and the DQ250 (wet clutch, 6-speed); later Golfs…