Diagnostic Trouble Code (DTC) Information

Diagnostic trouble code (DTC) information ECM-250A

Condition
Engine Control Module (ECM) receives information from the heated oxygen sensor about fuel/air mixture in different load areas. If Engine Control Module (ECM) registers that fuel/air mixture deviates too much from target lambda, so that adaptations end up in any of its end-positions, the diagnostic trouble code is generated.

Substitute value
- None.

Possible source

Upper limit
- Incorrectly installed oil dipstick. Air leakage.
- Air leakage in the intake system.
- Air leakage in the exhaust system.
- Low fuel pressure.
- Damaged mass air flow (MAF) sensor.

Lower limit
- Oil level too high.
- Contaminated engine oil.
- Leaking injectors.
- Damaged evaporative emission system (EVAP) valve.
- High fuel pressure.
- Damaged mass air flow (MAF) sensor.

Fault symptom[s]
- Warning lights and chimes/Malfunction Indicator Light ("Check engine" light) indication/no indication
- Text window and warning symbol/Yellow symbol and text message
- Driving/Poor performance/lacks power
- Fuel system/Excessive fuel consumption