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Home >> Chrysler >> 2009 >> 300 Signature Series >> Repair and Diagnosis >> External Pages >> Different car >> Section 354 (Gas - DTCS P2099 To P2271) >> P2271-O2 Sensor 1/2 Signal Biased Rich >> Possible Causes

Possible Causes

WARNING: This page is about a different car, the 2010 Dodge Charger and 2010 Chrysler 300. However, it is still accessible from the selected car via links, so may be relevant.
Possible Causes 
INTERMITTENT DTC
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. See  DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure  .