Set Condition

WARNING: This page is about a different car, the 2017 Jeep Cherokee. However, it is still accessible from the selected car via links, so may be relevant.

The Powertrain Control Module (PCM) monitors the Downstream O2 Sensor feedback control, called downstream fuel trim, to detect any shift in the exhaust gas from nominal. The PCM detects that the value of the downstream fuel trim exceeds the rich threshold and the feedback system has shifted bias rich.