DTC ECM-7120

Condition







After a short delay after ignition has been switched on, a check is performed to check if the heated oxygen sensor (HO2S) guide circuit in the control module is active. Diagnostic trouble code (DTC) ECM-7120 is stored if the control signal in the control module does not vary.

Substitute value
Fuel trim is disabled after three restart attempts by the sensor guide circuit.

Possible source

Faulty signal:
- defective sensor guide sensor.

Fault symptom[s]
None.