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Home >> Chrysler >> 2009 >> 300 Signature Series >> Repair and Diagnosis >> External Pages >> Different car >> Section 105 (1.6L Engine - DTCS B2277 To P0131, Diagnostic Code Index, Pre-Diagnostic Troubleshooting Procedure & Intermittent Condition) >> Diagnosis And Testing >> P0131-1/1 O2 Sensor Shorted To Ground >> Possible Causes

Possible Causes

WARNING: This page is about a different car, the 2006 Chrysler PT Cruiser. However, it is still accessible from the selected car via links, so may be relevant.
Possible Causes 
O2 SENSOR OPERATION
(K41) O2 SENSOR SIGNAL CIRCUIT SHORTED TO GROUND
(K41) O2 SENSOR SIGNAL CIRCUIT SHORTED TO (K902) SENSOR GROUND CIRCUIT
(K41) O2 SENSOR SIGNAL SHORTED TO (K99) HEATER CONTROL CIRCUIT
PCM

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

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