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Home >> Jeep >> 2025 >> Grand Cherokee 4xe >> Repair and Diagnosis >> Engine Performance >> System >> 2.0L - DTCS P2174 To P2271 >> DTC Troubleshooting >> P2271 O2 Sensor 1/2 Signal Biased Rich >> Possible Causes

Possible Causes

Possible Causes
OXYGEN SENSOR WIRING OR CONNECTORS
O2 SENSOR 1/2
POWERTRAIN CONTROL MODULE (PCM)

Always perform the PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE before proceeding. Refer to:  2.0L - PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE  . 

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