P21A1-85 - Cylinder 6 Air-Fuel Ratio Imbalance - Signal above allowable range: Action

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: Operational requirements needed to allow the monitor to be fully tested. Engine coolant temperature greater than 50°C, drive vehicle at steady load in 6th gear to achieve an engine speed of 1200 - 2400 rpm, maintain these conditions for 10 minutes (highway cruise).

Using the Jaguar Land Rover approved diagnostic equipment check powertrain control module for related misfire DTCs and refer to this DTC index. Rectify these first
Inspect connectors for signs of water ingress, and pins for damage and/or corrosion
Check for air leak on intake manifold to cylinder head connection
Check for external fuel leak at fuel injector
Check for fuel restriction within fuel injector
Check for damage/restriction of fuel rail
Check for air leak around spark plug
Check for air leak around fuel injector
Check and install a new fuel injector as required
Check and install a new ignition coil as required
Using the Jaguar Land Rover approved diagnostic equipment, clear the DTCs and retest