Ford Diagnostic Trouble Codes
Common OBD2 fault codes found on Ford vehicles with model-specific causes, known issues, TSBs, and adjusted repair cost estimates. Each guide is tailored for Ford owners.
Fuel System
Fuel Rail/System Pressure - Too Low
Ford Focus • 2008-2024
The 1.6 TDCi and 2.0 TDCi diesels can develop P0087 from fuel filter neglect or fuel contamination. ...
Mass or Volume Air Flow Circuit Low Input
Ford Focus • 2011–2024
The Focus 1.6 and 2.0 EcoBoost engines are sensitive to MAF contamination because of high blow-by ra...
Mass or Volume Air Flow Circuit High Input
Ford Focus • 2011–2024
Ford Focus EcoBoost (1.6, 1.8, 2.0) sensors can fail high after long periods without MAF cleaning. F...
Fuel Trim Malfunction (Bank 1)
Ford Focus • 2005-2024
The 1.6 Ti-VCT and 2.0 GDI petrol engines can trigger P0170 from vacuum leaks at the intake manifold...
System Too Lean (Bank 1)
Ford Focus • 2008-2024
On the Focus, P0171 frequently traces to a dirty MAF sensor and to cracked or perished PCV and crank...
System Too Rich (Bank 1)
Ford Focus • 2005-2024
On the 1.6 and 2.0 Duratec and the 1.0 EcoBoost, a contaminated MAF sensor is the usual P0172 trigge...
Injector Circuit / Open - Cylinder 1
Ford Focus • 2005-2024
On EcoBoost petrol engines the cylinder 1 injector harness routes near the hot exhaust side and chaf...
Injector Circuit / Open - Cylinder 2
Ford Focus • 2005-2024
On EcoBoost petrol engines the cylinder 2 injector harness routes near the hot exhaust side and chaf...
Injector Circuit / Open - Cylinder 3
Ford Focus • 2005-2024
On EcoBoost petrol engines the cylinder 3 injector harness routes near the hot exhaust side and chaf...
Injector Circuit / Open - Cylinder 4
Ford Focus • 2005-2024
On EcoBoost petrol engines the cylinder 4 injector harness routes near the hot exhaust side and chaf...
Injector Circuit / Open - Cylinder 5
Ford Focus • 2005-2024
Most Focus engines are four-cylinder, but the first-generation Focus ST and RS used the five-cylinde...
Injector Circuit / Open - Cylinder 6
Ford Focus • 2005-2024
All Focus engines are four or five cylinder, so P0206 does not apply to the Focus itself. Owners cro...
Turbocharger/Supercharger "A" Underboost Condition
Ford Focus • 2010-2024
The 1.0 EcoBoost is known for turbo failures at higher mileages due to coolant feed line issues caus...
Idle Air Control System RPM Lower Than Expected
Ford Focus • 2005-2014
Mk2 Focus with the 1.6 Duratec is prone to a sticky electronic throttle body causing P0506 along wit...
Emissions
Intake Air Temperature Sensor 1 Circuit High
Ford Focus • 2005-2024
On the 1.6 TDCi and 2.0 TDCi engines, the IAT sensor is integrated into the MAF sensor. If the MAF c...
O2 Sensor Heater Circuit Malfunction (Bank 1, Sensor 1)
Ford Focus • 2005-2024
On the 1.0 EcoBoost the upstream sensor sits close to the integrated exhaust manifold and turbo, so ...
O2 Sensor Circuit Low Voltage (Bank 1, Sensor 3)
Ford Transit • 2014–2024
The Transit with the 2.0 EcoBlue diesel uses an extended SCR aftertreatment that includes a third po...
O2 Sensor Circuit High Voltage (Bank 1, Sensor 3)
Ford Transit • 2014–2024
The Transit 2.0 EcoBlue with SCR aftertreatment commonly triggers P0144 from AdBlue residue contamin...
O2 Sensor Circuit Slow Response (Bank 1, Sensor 3)
Ford Transit • 2014–2024
The Transit 2.0 EcoBlue diesel triggers P0145 most often from continuous high-mileage thermal cyclin...
O2 Sensor Circuit No Activity Detected (Bank 1, Sensor 3)
Ford Transit • 2014–2024
The Transit 2.0 EcoBlue diesel sees P0146 most often from connector corrosion driven by road salt an...
O2 Sensor Heater Circuit Malfunction (Bank 1, Sensor 3)
Ford Transit • 2014–2024
The Transit 2.0 EcoBlue diesel sees P0147 from a mix of heater burnout (typical at 150,000+ km) and ...
Exhaust Gas Recirculation Flow Malfunction
Ford Focus • 2005-2022
The 1.6 TDCi engine uses a vacuum-actuated EGR valve that is prone to carbon buildup and diaphragm f...
Exhaust Gas Recirculation (EGR) Flow Insufficient
Ford Focus • 2005-2024
Many Ford petrol Focus models use a DPFE (Delta Pressure Feedback EGR) sensor, and a cracked or bloc...
Catalyst System Efficiency Below Threshold (Bank 1)
Ford Focus • 2005-2024
On the 1.6 and 1.0 EcoBoost Focus, coolant intrusion from a failing intake manifold or head gasket c...
Catalyst System Efficiency Below Threshold (Bank 2)
Ford Focus • 2005-2024
Almost all Focus models use inline-4 engines, which are single-bank and physically cannot set a true...
O2 Sensor Signal Biased/Stuck Lean (Bank 1, Sensor 1)
Ford Focus • 2005-2024
On the Focus, including the 1.0 EcoBoost and the older 1.6 and 2.0 petrol engines, P2195 is most oft...
DEF (AdBlue) System: Time Limit For Restricted Operation Mode Exceeded
Ford Transit Diesel • 2016-2024
Ford Transit 2.0 EcoBlue and the older 2.2 TDCi with SCR develop P246F most often from AdBlue level ...
Cooling System
Engine Coolant Temperature (ECT) Circuit
Ford Focus • 2005-2024
The Ford Focus coolant temperature sensor is straightforward to replace on most petrol and diesel va...
Engine Coolant Temperature (ECT) Circuit Range / Performance
Ford Focus • 2005-2024
On the Ford Focus, a stuck-open thermostat is the leading cause of P0116, particularly on higher-mil...
Engine Coolant Temperature (ECT) Circuit Low
Ford Focus • 2005-2024
The Ford Focus can set P0117 from a shorted sensor or from a chafed harness near the engine, where i...
Engine Coolant Temperature (ECT) Circuit High
Ford Focus • 2005-2024
The Ford Focus can set P0118 from an open sensor, a corroded connector, or a broken signal wire near...
Coolant Thermostat Below Regulating Temperature
Ford Focus • 2005-2024
On the 1.0L EcoBoost and 1.6L Duratec, the thermostat is integrated into a plastic housing that also...
Misfire
Random/Multiple Cylinder Misfire Detected
Ford Focus • 2011-2024
The 1.0 EcoBoost three-cylinder is sensitive to spark plug and coil wear, and because it has only th...
Cylinder 1 Misfire Detected
Ford Focus • 2005-2022
The 1.0 EcoBoost is prone to coolant intrusion into cylinder 1 from a known degas-hose and head weak...
Cylinder 4 Misfire Detected
Ford Focus • 2005-2022
On the 1.6 Ti-VCT and 2.0 Duratec engines, cylinder 4 is at the rear of the engine near the firewall...
Ignition
Crankshaft Position Sensor "A" Circuit Malfunction
Ford Focus • 2005-2022
On the 1.6 TDCi (DV6) and 1.8 TDCi engines, the crankshaft sensor is mounted low on the engine block...
Camshaft Position Sensor Circuit Malfunction
Ford Focus • 2005-2024
On the Ford Focus the CMP sensor is generally easy to reach, which keeps labour low. Duratec and Eco...
EVAP System
Evaporative Emission Control System Malfunction
Ford Focus • 2005–2024
The Focus Mk2 and Mk3 use a screw-type fuel cap with a rubber seal that hardens over time. A worn ca...
Evaporative Emission System: Incorrect Purge Flow
Ford Focus • 2005-2024
On the Ford Focus the canister purge valve (CPV) is the most common P0441 cause, especially on the 1...
Evaporative Emission System Leak Detected (Small Leak)
Ford Focus • 2005-2022
The Focus uses a vacuum-based EVAP monitoring system. The purge valve on the 1.6 Ti-VCT and 2.0 GDI ...
Evaporative Emission Control System Vent Control Circuit Open
Ford Focus • 2005–2024
On the Focus Mk2 and Mk3, the vent valve (Ford calls it the canister vent solenoid) is mounted on to...
Evaporative Emission Control System Vent Control Circuit Shorted
Ford Focus • 2005–2024
The Focus Mk2 and Mk3 canister vent solenoid harness is routed close to the rear suspension. Wagon v...
Evaporative Emission Control System Vent Valve/Solenoid Circuit Malfunction
Ford Focus • 2005–2024
P0449 on the Focus Mk2 and Mk3 is usually a failed canister vent solenoid. Ford parts are widely ava...
Evaporative Emission Control System Pressure Sensor Intermittent
Ford Focus • 2005–2024
On the Focus Mk2 and Mk3 the FTP sensor is on top of the tank and requires dropping the tank for acc...
Evaporative Emission System Leak Detected (Large Leak)
Ford Fiesta • 2008-2023
The Fiesta Mk7 has EVAP hoses routed along the underfloor near the fuel tank that can be damaged dur...
Evaporative Emission Control System Leak Detected (Fuel Cap Loose/Off)
Ford Focus • 2005–2024
Ford Focus Mk2 uses a standard screw-type cap with a tether. Mk3 introduced the Easy Fuel capless sy...
Evaporative Emission System: High Purge Flow
Ford Focus • 2005-2024
The Focus sets P0496 most often from a purge valve (canister purge solenoid) that no longer seals fu...
Electrical
Vehicle Speed Sensor "A" Malfunction
Ford Focus • 2005-2022
The Focus uses a transmission-mounted speed sensor that is prone to oil contamination from gearbox s...
Vehicle Speed Sensor "A" Range/Performance
Ford Focus • 2005-2022
Mk2 and Mk3 Focus are well known for ABS reluctor ring corrosion in UK and northern EU climates. Roa...
Vehicle Speed Sensor "A" Circuit Low Input
Ford Focus • 2005-2022
Mk2 and Mk3 Focus suffer rear bearing magnetic encoder failures. When the encoder ring inside the be...
Vehicle Speed Sensor "A" Intermittent/Erratic/High
Ford Focus • 2005-2022
Mk2 and Mk3 Focus log P0503 most often from a rear bearing encoder ring that has started to delamina...
Idle Air Control System Circuit Low
Ford Focus • 2000-2007
Mk1 and early Mk2 Focus with the Zetec engine use a separate IAC valve that suffers connector contam...
Idle Air Control System Circuit High
Ford Focus • 2000-2007
Mk1 and early Mk2 Focus with the 1.6 and 1.8 Zetec are prone to broken control wires at the IAC conn...
Serial Communication Link Malfunction
Ford Focus • 2005-2022
The Focus Mk2 and Mk3 are known for CAN bus issues caused by corroded connectors in the engine bay. ...
ECM/PCM Processor Fault
Ford Focus • 2005-2024
On the Focus, P0606 (and the related P0605 EEPROM error) often follows a low or failing battery, so ...
Transmission
Transmission Control System Malfunction
Ford Focus • 2011-2018
The Focus Mk3 with the Powershift (DPS6) dual-clutch transmission is notorious for P0700 codes. Know...
Output Speed Sensor Circuit Malfunction
Ford Focus • 2005-2022
Focus Mk2 models with the 4F27E automatic and Mk3 models with the Powershift DCT can both trigger P0...
Diagnose your Ford with Skanyx
Connect a standard Bluetooth OBD2 adapter to your Ford, scan for codes, and get AI-powered diagnostics with severity ratings and repair cost estimates.
Download Skanyx