Diagnostic Trouble Code (DTC) Information

Diagnostic trouble code (DTC) information ECM-249B

Condition




The diagnostic trouble code (DTC) is stored if the engine control module (ECM) registers an open-circuit in the signal cable to the component of the front heated oxygen sensor (HO2S) that detects the oxygen content of the exhaust gases.

Substitute value
None.

Possible source
- Contact resistance or oxidation on the signal cable
- Open-circuit in the signal cable
- Damaged front heated oxygen sensor (HO2S).

Fault symptom[s]
- Malfunction indicator lamp (MIL) lit.