|P013C – O2 Sensor Slow Response – Rich to Lean (Bank 2, Sensor 2)|
|P013B – O2 Sensor Slow Response – Lean to Rich Bank 1, Sensor 2|
|Description: During a deceleration fuel shut-off (DFSO) event, the powertrain control module (PCM) monitors how quickly the rear heated oxygen sensor (HO2S) switches from lean to rich. The measured rate of the lean to rich switch is compared to a calibrated fault threshold value.
The measured rate of the lean to rich switch is compared to a calibrated fault threshold value. This DTC sets if the measured value is slower than the threshold value.
Possible Causes: • Exhaust leaks before or near the HO2S
• Damaged HO2S
Diagnostic Aids: Check for leaks in the exhaust system.