DTC P21A3-84: Cylinder 8 Air-Fuel Ratio Imbalance - Signal below allowable range: Action

WARNING: This page is about a different car, the 2018 Land Rover Range Rover, 2017 Land Rover Range Rover, 2016 Land Rover Range Rover, 2014 Land Rover Range Rover, and 2013 Land Rover Range Rover. 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
Check condition of airpath from throttle to cylinder. Check for intake air system blockage, restricting air from entering cylinders
Check for damage/restriction of fuel rail
Check for blockage/restriction within exhaust manifold
Check and install a new fuel injector as required
Using the Jaguar Land Rover approved diagnostic equipment check powertrain control module for related camshaft profile switching system DTCs and refer to this DTC index
Using the Jaguar Land Rover approved diagnostic equipment, clear the DTCs and retest