Fault description

Diagnosis monitors the entire secondary air system in terms of plausible operation and whether sufficient secondary air is injected into the system.

Cylinder bank 2:

Differential pressure of secondary air valve too high (>180 mba, provisional value)

and

Lambda too low (< 1.08; provisional value)

Possible cause of fault:

Valve, cylinder bank 2, stuck closed or system blockage, probably cylinder bank 2