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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 >> P0038-1/2 O2 Sensor Heater Circuit High >> 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 
(K299) O2 SENSOR HEATER CONTROL CIRCUIT SHORTED TO (K342) ASD RELAY OUTPUT CIRCUIT
O2 HEATER ELEMENT
(K299) O2 SENSOR HEATER CONTROL CIRCUIT SHORT TO VOLTAGE
PCM

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

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