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Home >> Dodge and Ram >> 2012 >> Caliber SXT Plus, Automatic CVT Trans >> Repair and Diagnosis >> Engine Performance >> System >> 2.0L - DTCS P2115 To U1418 >> Diagnosis And Testing >> P2271-O2 Sensor 1/2 Signal Biased Rich >> Possible Causes

Possible Causes

POSSIBLE CAUSES 
EXHAUST LEAK
OXYGEN SENSOR WIRING OR CONNECTORS
O2 SENSOR SIGNAL CIRCUIT
O2 SENSOR RETURN CIRCUIT
1/2 OXYGEN SENSOR
POWERTRAIN CONTROL MODULE (PCM)

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Refer to  PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE  . 

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