Possible Fault Causes
Sensor inactive. Open circuit in wire IA Catalyst contaminated (rich exhaust gas at O2 sensor during overrun injection deactivation); oil or gasoline in exhaust gases during overrun injection deactivation.
Sensor inactive. Open circuit in wire IA Catalyst contaminated (rich exhaust gas at O2 sensor during overrun injection deactivation); oil or gasoline in exhaust gases during overrun injection deactivation.