Ford Error Codes

System Too Lean (Bank 1) — very common on Ford vehicles with vacuum leaks.

Small Evaporative Emission Leak — a small leak has been detected in the evaporative emission control system.

Large Evaporative Emission Leak — a large leak has been detected in the EVAP system.

Idle Control System Malfunction — the idle speed control is not functioning correctly.

System too lean (Bank 1) — the engine is getting too much air or too little fuel.

Idle air control system malfunction — the engine cannot maintain stable idle speed.

Intake air temperature (IAT) sensor high input — the sensor is reading abnormally high air temperature.

Random/Multiple Cylinder Misfire — engine misfiring on multiple cylinders.

Mass Airflow Sensor Circuit Low — the MAF sensor is outputting a lower voltage than expected.

O2 Sensor Circuit Low Voltage (Bank 1, Sensor 1) — the upstream oxygen sensor is reading too lean.

System Too Rich (Bank 1) — the engine is running with too much fuel relative to air.

EGR Flow Insufficient Detected — the Exhaust Gas Recirculation system is not flowing enough gas.

Idle Air Control System RPM Lower Than Expected — engine idle speed is below target.

Transmission Control System Malfunction — the TCM has set a fault and triggered the MIL (check engine light).

Right Front Wheel Speed Sensor Malfunction — ABS wheel speed sensor circuit fault.

Lost Communication with ECM/PCM — the diagnostic network has lost communication with the engine control module.

Fuel Rail Pressure Sensor Circuit Range/Performance — the fuel rail pressure sensor reading is outside expected range.

OBD Systems Readiness Test Not Complete — the OBD-II monitors have not completed their self-tests since the last code clear or battery disconnect.

Turbine Speed Sensor Circuit Malfunction — the transmission input shaft speed sensor has a circuit fault.