Ford Diagnostic Trouble Codes
OBD2 fault codes seen on Ford vehicles, with what each code means, its typical repair cost range, and notes on specific Ford models.
Electrical
Intake Camshaft Position - Timing Over-Retarded (Bank 1)
Ford F-150 5.4L 3V Triton • 2004-2010
The 3-valve 5.4L is notorious for cam phaser failure. Loud diesel-like rattle at idle plus P0012 or ...
Throttle Position Sensor/Switch A Circuit Range/Performance Problem
Ford F-150 • 2004-2010 (4.6L and 5.4L Triton V8)
Symptom is typically a yellow wrench warning with limp mode. Replacement throttle body (Motorcraft 3...
Throttle/Pedal Position Sensor/Switch A Circuit Low Input
Ford F-150 • 2004-2010 (5.4L 3V Triton and 4.6L)
On these trucks the electronic throttle body wears at the sensor wiper track and starts reporting a ...
Throttle/Pedal Position Sensor/Switch A Circuit High Input
Ford F-150 • 2004-2010
5.4L 3V Triton trucks show P0123 with wiper-track wear inside the electronic throttle body....
Camshaft Position Sensor A Circuit Malfunction (Bank 2)
Ford F-150 5.4L 3V Triton • 2004-2010
The 3V 5.4L is infamous for VCT phaser rattle and failure, which throws P0345 alongside P0344/P0346....
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...
Engine Oil Pressure Sensor/Switch Circuit Malfunction
Ford F-150 • 2004-2010
5.4L 3V Triton uses a simple pressure switch, not a variable sensor, so the dash gauge is a dummy th...
Engine Oil Pressure Sensor/Switch Range/Performance
Ford F-150 • 2004-2010
5.4L 3V Triton. Sensor threads into the oil filter adapter, easy 15-minute swap. Harness rub near th...
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 ...
High Speed CAN Communication Bus
Ford Fiesta • 2014-2019
Ford's manual for this Fiesta lists two networks at the OBD2 connector: the high-speed CAN on pins 6...
Lost Communication With ECM/PCM 'A'
Ford F-150 (11th/12th gen) • 2004-2014
5.4L 3V and 3.5L EcoBoost F-150s frequently set U0100 from moisture in the PCM connector under the c...
Lost Communication With Anti-Lock Brake System (ABS) Control Module
Ford F-150 • 2009-2014 (12th gen, 5.0L Coyote and 3.5L EcoBoost)
The HCU/ABS module sits low on the driver's frame rail and takes a beating from road spray....
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
On Focus EcoBoost engines, oil mist carried through the crankcase ventilation can settle on the hot-...
Mass or Volume Air Flow Circuit High Input
Ford Focus • 2011-2024
Focus EcoBoost engines (the smaller petrols, the ST's 2.0 and the 2016-2018 RS's 2.3) can report a h...
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 second-generation Focus ST and RS used the five-cylind...
Turbocharger/Supercharger Boost Sensor "A" Circuit Range/Performance
Ford Fiesta ST 1.6 EcoBoost • 2013-2018
The Fiesta ST's 1.6 EcoBoost has two separate pressure sensors: a MAP sensor on the engine, reached ...
Turbocharger/Supercharger Boost Sensor "A" Circuit High
Ford Fiesta ST 1.6 EcoBoost • 2013-2018
On the Fiesta ST's 1.6 EcoBoost the boost sensor behind this code is the combined turbocharger boost...
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 2 Circuit High
Ford Focus • 2011-2024
On EcoBoost engines Ford calls this circuit IAT2, intake air temperature sensor 2, and that name mat...
Manifold Absolute Pressure/Barometric Pressure Circuit Low
Ford Focus • 2011-2024
On EcoBoost engines P0107 refers to the MAP sensor mounted on the intake manifold, downstream of the...
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...
Oxygen Sensor Circuit No Activity Detected (Bank 1, Sensor 1)
Ford F-150 • 2004-2014
5.4L 3V Triton is notorious for broken exhaust manifold studs that let exhaust leak past the upstrea...
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 ...
Exhaust Gas Recirculation Flow Malfunction
Ford Focus • 2005-2022
The 1.6 TDCi uses the same DV6 diesel as Peugeot's 1.6 HDi. Depending on the version, its EGR valve ...
Exhaust Gas Recirculation (EGR) Flow Insufficient
Ford Focus • 2005-2024
Where a Ford petrol engine uses a DPFE (Delta Pressure Feedback EGR) sensor, a cracked or blocked DP...
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...
Post Catalyst Fuel Trim System Too Lean Bank 1
Ford F-150 • 2009-2016
On the 5.0L Coyote a cracked exhaust manifold and on the 3.5L EcoBoost a snapped manifold stud both ...
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...
Intake Air System Leak
Ford F-150 5.4L Triton 3V • 2004-2010
The 5.4L 3V is well documented for split PCV hose elbows and cracked plastic intake manifolds around...
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...
Cooling Fan 1 Control Circuit Malfunction
Ford F-150 • 2004-2014
5.4L Triton trucks with an electric fan use a fan control module on the shroud, which can fail from ...
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...
Cylinder 5 Misfire Detected
Ford F-150 5.4L Triton 3V • 2004-2010
The 5.4L 3-valve Triton is hard on coil-on-plug packs, and its two-piece spark plugs are known for b...
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...
Ignition Coil A Primary/Secondary Circuit Malfunction
Ford F-150 • 2004-2014
5.4L 3V Triton is prone to cracked coil boots and coils arcing to the head. Ford changed the coil ve...
Ignition Coil B Primary/Secondary Circuit Malfunction
Ford F-150 • 2004-2014
The 5.4L 3V Triton's coil-on-plug units commonly fail at high mileage, and Ford changed the coil ver...
Ignition Coil C Primary/Secondary Circuit Malfunction
Ford F-150 • 2004-2010 (5.4L 3-valve Triton V8)
The 5.4L 3V is known for two-piece spark plugs seizing in the head and breaking during removal. If P...
Ignition Coil D Primary/Secondary Circuit Malfunction
Ford F-150 • 2004-2014
5.4L 3V Triton is notorious for coil-on-plug failure. Replace the coil and the plug together on the ...
EVAP System
Evaporative Emission Control System Malfunction
Ford Focus • 2005-2024
The Mk2 Focus uses a screw-type fuel cap with a rubber seal that hardens over time, and a worn cap s...
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 test. The purge valve on the 1.6 Ti-VCT and 2.0 GDI engines is mo...
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. Aftermarket solenoids typ...
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...
Transmission
Transmission Control System Malfunction
Ford Focus • 2011-2018
The Focus Mk3 with the Powershift (DPS6) dual-clutch transmission is well known for P0700 codes. Kno...
Transmission Range Sensor Circuit Malfunction (PRNDL Input)
Ford F-150 • 2004-2014
The digital TR sensor on 4R70W, 4R75W and 5R55 transmissions is a documented weak point. Intermitten...
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...
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