My check engine light came on yestarday in my 95 Max and I ran the diagnostics (the set screw in the side of the ECU) and i got the Error code 0503

I found this about that code on the forums:

0503
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

I reset the check engine light without fixing the problem. If the problem does really exist should the check engine light come back on sometime soon, or did I screw it up?

Thanks in advance.

 

It will come back if the ecu sees another out of range voltage from that sensor