Possible Fault Causes
Catalytic converter obstructed (rich exhaust gas on O2 sensor during overrun cutoff); oil or gasoline in exhaust gas during overrun cutoff; defective wiring; Defective pre-cat O2 sensor.
Catalytic converter obstructed (rich exhaust gas on O2 sensor during overrun cutoff); oil or gasoline in exhaust gas during overrun cutoff; defective wiring; Defective pre-cat O2 sensor.