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Diagnostic Codes/125 codes

OBD2 Diagnostic Trouble Codes

Browse our complete database of OBD2 fault codes. Each code page includes plain-English explanations, ranked causes, estimated repair costs, and vehicle-specific diagnostic guides powered by Skanyx AI data.

Electrical

Emissions

P0011Moderate

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

BMWVolkswagenPeugeot+1 more
P0015Moderate

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

AudiVolkswagenSkoda
P0021Moderate

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

BMWAudiMercedes-Benz+1 more
P0022Moderate

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

BMWAudiMercedes-Benz+1 more
P0106Moderate

Manifold Absolute Pressure/Barometric Pressure Circuit Range/Performance

OpelRenaultToyota
P0113Low

Intake Air Temperature Sensor 1 Circuit High

FordPeugeotVolkswagen
P0131Moderate

O2 Sensor Circuit Low Voltage (Bank 1 Sensor 1)

ToyotaVolkswagenHonda
P0135Low

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

ToyotaHondaVolkswagen+1 more
P0136Moderate

O2 Sensor Circuit Malfunction (Bank 1, Sensor 2)

BMWVolkswagenAudi+1 more
P0137Moderate

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

BMWVolkswagenAudi+1 more
P0138Moderate

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

BMWVolkswagenAudi+1 more
P0139Moderate

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

BMWVolkswagenAudi+1 more
P0140Moderate

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

BMWVolkswagenAudi+1 more
P0141Low

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

ToyotaHondaVolkswagen+1 more
P0143Moderate

O2 Sensor Circuit Low Voltage (Bank 1, Sensor 3)

BMWVolkswagenFord+1 more
P0144Moderate

O2 Sensor Circuit High Voltage (Bank 1, Sensor 3)

BMWVolkswagenFord+1 more
P0145Moderate

O2 Sensor Circuit Slow Response (Bank 1, Sensor 3)

BMWVolkswagenFord+1 more
P0146Moderate

O2 Sensor Circuit No Activity Detected (Bank 1, Sensor 3)

BMWVolkswagenFord+1 more
P0147Low

O2 Sensor Heater Circuit Malfunction (Bank 1, Sensor 3)

BMWVolkswagenFord+1 more
P0400Moderate

Exhaust Gas Recirculation Flow Malfunction

VolkswagenFordOpel+1 more
P0401Low

Exhaust Gas Recirculation (EGR) Flow Insufficient

ToyotaHondaVolkswagen+1 more
P0402Moderate

Exhaust Gas Recirculation Flow Excessive Detected

BMWVolkswagenAudi+1 more
P0403Moderate

Exhaust Gas Recirculation Control Circuit Malfunction

BMWVolkswagenAudi+1 more
P0404Moderate

Exhaust Gas Recirculation Control Circuit Range/Performance

BMWVolkswagenAudi+1 more
P0405Moderate

Exhaust Gas Recirculation Sensor "A" Circuit Low

BMWVolkswagenAudi+1 more
P0406Moderate

Exhaust Gas Recirculation Sensor "A" Circuit High

BMWVolkswagenAudi+1 more
P0407Moderate

Exhaust Gas Recirculation Sensor "B" Circuit Low

BMWVolkswagenAudi+1 more
P0408Moderate

Exhaust Gas Recirculation Sensor "B" Circuit High

BMWVolkswagenAudi+1 more
P0410Low

Secondary Air Injection System Malfunction

VolkswagenBMWAudi+1 more
P0411Low

Secondary Air Injection System Incorrect Flow Detected

VolkswagenBMWSkoda+1 more
P0420Moderate

Catalyst System Efficiency Below Threshold (Bank 1)

ToyotaHondaVolkswagen+1 more
P0421Moderate

Warm Up Catalyst Efficiency Below Threshold (Bank 1)

BMWVolkswagenAudi+1 more
P0422Moderate

Main Catalyst Efficiency Below Threshold (Bank 1)

BMWVolkswagenAudi+1 more
P0423Moderate

Heated Catalyst Efficiency Below Threshold (Bank 1)

BMWVolkswagenAudi+1 more
P0424Moderate

Heated Catalyst Temperature Below Threshold (Bank 1)

BMWVolkswagenAudi+1 more
P0430Moderate

Catalyst System Efficiency Below Threshold (Bank 2)

ToyotaHondaVolkswagen+1 more
P0431Moderate

Warm Up Catalyst Efficiency Below Threshold (Bank 2)

BMWVolkswagenAudi+1 more
P0432Moderate

Main Catalyst Efficiency Below Threshold (Bank 2)

BMWVolkswagenAudi+1 more
P0433Moderate

Heated Catalyst Efficiency Below Threshold (Bank 2)

BMWVolkswagenAudi+1 more
P0434Moderate

Heated Catalyst Temperature Below Threshold (Bank 2)

BMWVolkswagenAudi+1 more
P2002High

Diesel Particulate Filter Efficiency Below Threshold (Bank 1)

VolkswagenBMWPeugeot+1 more
P244AModerate

Diesel Particulate Filter Differential Pressure Too Low (Bank 1)

BMWVolkswagenMercedes-Benz+1 more
P244BHigh

Diesel Particulate Filter Differential Pressure Too High (Bank 1)

BMWVolkswagenMercedes-Benz+1 more
P246FCritical

DEF (AdBlue) System: Time Limit For Restricted Operation Mode Exceeded

BMWVolkswagenMercedes-Benz+1 more

Ignition

Fuel System

P0087High

Fuel Rail/System Pressure - Too Low

VolkswagenBMWFord
P0101Moderate

Mass Air Flow Sensor Range/Performance

ToyotaHondaVolkswagen+1 more
P0102Moderate

Mass or Volume Air Flow Circuit Low Input

BMWVolkswagenAudi+1 more
P0103Moderate

Mass or Volume Air Flow Circuit High Input

BMWVolkswagenAudi+1 more
P0170Moderate

Fuel Trim Malfunction (Bank 1)

Mercedes-BenzOpelFord
P0171Moderate

System Too Lean (Bank 1)

ToyotaHondaVolkswagen+1 more
P0172Moderate

System Too Rich (Bank 1)

ToyotaHondaVolkswagen+1 more
P0173Moderate

Fuel Trim Malfunction (Bank 2)

BMWAudiMercedes-Benz+1 more
P0174Moderate

System Too Lean (Bank 2)

ToyotaHondaVolkswagen+1 more
P0175Moderate

System Too Rich (Bank 2)

BMWAudiMercedes-Benz+1 more
P0191Moderate

Fuel Rail Pressure Sensor Circuit Range/Performance

VolkswagenBMWMercedes-Benz
P0201Moderate

Injector Circuit / Open - Cylinder 1

VolkswagenBMWFord+1 more
P0202Moderate

Injector Circuit / Open - Cylinder 2

VolkswagenBMWFord+1 more
P0203Moderate

Injector Circuit / Open - Cylinder 3

VolkswagenBMWFord+1 more
P0204Moderate

Injector Circuit / Open - Cylinder 4

VolkswagenBMWFord+1 more
P0205Moderate

Injector Circuit / Open - Cylinder 5

VolkswagenBMWFord+1 more
P0206Moderate

Injector Circuit / Open - Cylinder 6

VolkswagenBMWFord+1 more
P0234High

Turbocharger/Supercharger "A" Overboost Condition

VolkswagenBMWRenault
P0299Moderate

Turbocharger/Supercharger "A" Underboost Condition

VolkswagenFordSkoda+1 more
P0506Moderate

Idle Air Control System RPM Lower Than Expected

ToyotaVolkswagenFord+1 more
P0507Moderate

Idle Control System RPM Higher Than Expected

ToyotaHondaVolkswagen+1 more
P2004Moderate

Intake Manifold Runner Control Stuck Open (Bank 1)

VolkswagenAudiSkoda+1 more
P2006Moderate

Intake Manifold Runner Control Stuck Closed (Bank 1)

VolkswagenAudiSEAT+1 more
P2015Moderate

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

VolkswagenAudiSkoda+1 more
P2187Moderate

System Too Lean at Idle (Bank 1)

VolkswagenBMWAudi+1 more
P2188Moderate

System Too Rich at Idle (Bank 1)

VolkswagenBMWOpel+1 more

Cooling System

Misfire

EVAP System

Transmission

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