FixVault

Home › Jeep › 2017 › Grand Cherokee Laredo, AWD › Repair and Diagnosis › Engine Performance › System › 3.6L - DTCS P2100 To U0121 › DTC Troubleshooting › P2271-O2 Sensor 1/2 Signal Biased Rich › Set Condition

Set Condition

The PCM detects that the Downstream O2 Sensor does not transition from a rich to lean condition within a specific time during a DFSO event.