Diagnostic Trouble Code (DTC) Information

Diagnostic trouble code (DTC) information

Condition




Diagnostic trouble code EFI-153 is stored if: The heated oxygen sensor (HO2S) signal cable is short-circuited to ground and the control module interprets as a fault (signal too low). Or the heated oxygen sensor (HO2S) signal lies above or below a certain limit and has been interpreted as a fault. The diagnostic trouble code (DTC) is stored if the signal lies between the values but does not change (faulty signal).

Substitute value
- Fuel trim disabled.
- Catalytic converter diagnostics disabled.

Possible source

Signal too low:
- Short-circuit to ground in the signal cable.
- Faulty heated oxygen sensor (HO2S).

Rich limit:
- Faulty heated oxygen sensor (HO2S).

Lean limit:
- Faulty heated oxygen sensor (HO2S).

Faulty signal:
- Air leakage in the exhaust system.
- Defective rear heated oxygen sensor (HO2S).

Fault symptom[s]
- None.