Failing MOT emissions test at fast idle CO 1.32%. Fault codes stored P0140 oxygen sensor bank 1 sensor 2 no signal, P1105 oxygen sensor heater circuit bank 1 sensor 2 short to battery positive & P1176 lambda correction bank 1 sensor 2 control limit reached. The throttle body was cleaned, coolant temperature sensor and EVAP system operation checked and both catalytic converters and front lambda sensor were replaced. Fault not cured and still failing emissions test.
The fault was cured by cleaning the intake system with Forté Valve Cleaner as per instructions and adding 2 x Forté Petrol Specialist Injector Cleaner into the fuel tank. After treatment the vehicle was taken on an extended road test, emissions retested and passed.
Thanks to Paul at Dave Coles Garage Gosport Ltd in Gosport, Hampshire.
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