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Home › Jeep › 2021 › Grand Cherokee L Laredo, AWD › Repair and Diagnosis › Engine Performance › System › 3.6L - DTCS P0037 To P0152 › Diagnosis And Testing › P0139-O2 Sensor 1/2 Slow Response › Set Condition

Set Condition

If the PCM does not detect a rich to lean switch within a specific time during a Decel Fuel Shutoff Event, the monitor will fail.