Diagnostic Trouble Code (DTC) Information

Diagnostic trouble code (DTC) information ECM-24BD

Condition




The engine control module (ECM) monitors the function of the front heated oxygen sensor (HO2S) (bank 1) by checking its signal. The diagnostic trouble code (DTC) is stored if the engine control module (ECM) registers that the signal from the front heated oxygen sensor (HO2S) indicates a lean fuel/air mixture while the signal from the rear heated oxygen sensor (HO2S) indicates a rich fuel/air mixture.

Note! The fault may be in the front or rear heated oxygen sensor (HO2S) circuit.

Substitute value
- Long-term fuel trim is switched off
- Three-way catalytic converter (TWC) diagnostics are disabled.

Possible source
- Leakage in the exhaust system
- Heated oxygen sensor (HO2S) indicates an incorrectly rich fuel/air mixture
- Damaged heated oxygen sensor (HO2S).

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