Possible Fault Causes
Sensor inactive. Wire IA is open. Catalyst is plugged (rich exhaust at O2 sensor in overrun cut-off); oil or gasoline in the exhaust gases during operation in overrun cut-off phase.
Sensor inactive. Wire IA is open. Catalyst is plugged (rich exhaust at O2 sensor in overrun cut-off); oil or gasoline in the exhaust gases during operation in overrun cut-off phase.