Possible Causes
NOTE:
Monitor description.
Detects when secondary fuelling adaptation offset is too large to maintain emissions within limits
- Exhaust system leakage between pre catalyst Heated Oxygen Sensor (HO2S) and mid catalyst Heated Oxygen Sensor (HO2S)
- Pre catalyst Heated Oxygen Sensor (HO2S) not installed correctly
- Mid catalyst Heated Oxygen Sensor (HO2S) not installed correctly
- Mid catalyst Heated Oxygen Sensor (HO2S) installed in incorrect bank
- Connector is disconnected, connector pin is backed out, connector pin corrosion
- Pre catalyst Heated Oxygen Sensor (HO2S) circuit, short circuit to ground, short circuit to power, open circuit, high resistance
- Mid catalyst Heated Oxygen Sensor (HO2S) circuit, short circuit to ground, short circuit to power, open circuit, high resistance
- Pre catalyst Heated Oxygen Sensor (HO2S) damaged or contaminated internally
- Mid catalyst Heated Oxygen Sensor (HO2S) damaged or contaminated internally