Diagnostic Trouble Code (DTC) Information

Diagnostic trouble code (DTC) information ECM-24BB

Condition




The engine control module (ECM) monitors the function of the front heated oxygen sensor (HO2S) (bank 1) by checking its signal. The engine control module (ECM) compares the adaptation values of the front and rear heated oxygen sensor (HO2S). The diagnostic trouble code (DTC) is stored when the values deviate by more than 3%.

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
- Contact resistance or oxidation in the terminals
- Damaged heated oxygen sensor (HO2S).

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