joezcool

I have an 0503 code on my '97 Max. Front right heated O2 sensor, can someone please help me with this. What is involved for fix? WHat can expect to pay? Thanks...Joe

Daniel B. Martin

Diagnostic Trouble Code 0503 indicates a problem with the front Oxygen Sensor on the right cylinder bank. The right bank is also called the rear bank. It is cylinders 1,3,5. A normal signal sweeps back and forth between 0.2 volts and 0.8 volts. This malfunction was detected when the Engine Control Module received a signal from the sensor which was a constant value of approximately 0.3 volts.

Possible causes include ...
- Harness or connectors (the sensor circuit is open or shorted).
- Defective Oxygen Sensor

Daniel B. Martin

You can buy a replacement Oxygen Sensor for about $80 and install it yourself. Refer to the Chilton repair manual (page 4-14) or the Haynes repair manual (page 6-14).

joezcool

Thanks Daniel

DCmax

iTrader: (2)

My ML light came on and it gave me the same code as you. Fortunatley Im covered under the recall for the 02 sensor in 96 Maximas. I have an appointment for repair on Thursday morning. Ill let you know if the repair fixed the problem.