Possible Causes
WARNING: This page is about a different car, the 2017 Jaguar XJ, 2016 Jaguar XJ, 2015 Jaguar XJ, 2014 Jaguar XJ, and 2013 Jaguar XJ. However, it is still accessible from the selected car via links, so may be relevant.
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