P219A-84: Bank 1 Air-Fuel Ratio Imbalance - Signal below allowable range: Action

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 1200-2400rpm, maintain these conditions for 10 minutes (highway cruise)

Using the manufacturer approved diagnostic system check engine 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 manufacturer approved diagnostic system check engine control module for related camshaft profile switching system DTCs and refer to this DTC index
Using the manufacturer approved diagnostic system clear all stored DTCs using the `Diagnosis Menu' tab and retest