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Q: ENGINE CODES on 2004 Chrysler 300M

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Here is some info from the repair manual about this code. It is a bit technical, but the problem points to an issue with the oxygen sensor circuit. The sensor is supposed to operate within a specific voltage range, and the control module measured a voltage above that range, meaning there is a fault in the wiring, sensor or the control module.

Trouble Code: P0138 (3.5L V6 VIN G Auto)
O2 (B1 S2) Sensor Voltage High Condition:
Trouble Code Conditions:
Engine runtime for 119 seconds; O2 Sensor heater temperature is more than 662ºF (350ºC); Battery voltage more than 10.99v. O2 Sensor voltage is above 3.7v for 60 seconds (300M, Magnum, Pacifica), or 3.99v for 60 seconds (PT Cruiser, Sebring, Stratus)

Possible Causes:
* O2 Sensor signal circuit or return circuit shorted to voltage
* O2 Sensor has failed
* O2 Sensor signal circuit or return circuit open
* PCM has failed
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