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.
This DTC is set when the value of the signal measured by the powertrain control module is not plausible given the operating conditions.

Exhaust system leakage
Mid catalyst heated oxygen sensor incorrectly installed
Post catalyst heated oxygen sensor incorrectly installed
Pre catalyst heated oxygen sensor circuit short circuit to ground, short circuit to power, open circuit, high resistance
Post catalyst heated oxygen sensor circuit short circuit to ground, short circuit to power, open circuit, high resistance
Pre catalyst heated oxygen sensor contamination or failure
Post catalyst heated oxygen sensor contamination or failure