If this adjustment fails proceed with Reset fuelling adaption (attempt 2).
Caution: On a vehicle with no fault this procedure is likely to slightly worsen engine emissions.
Reset fuelling adaptions to 100%.
If one or more of the following components have been renewed or rectified the adaption must be performed:
Fuel injection or oxygen sensor
Fuel pump or fuel rail
Inlet manifold pressure sensor
Inlet manifold/Air leak repair