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. ...
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...
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...
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...
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...
Misfire
Cylinder 1 Misfire Detected
Ford Focus • 2005-2022
The 1.0 EcoBoost engine is prone to coolant intrusion into cylinder 1 due to a known head gasket wea...
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
EVAP System
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 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...
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...
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. ...
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...
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