I checked the ECU code on my 95 Max (100K) and it was a 555. I couldn't find that code listed but got info from the Forum that the code meant there was no problem, is that correct? I have reset the light 3 times and after a week or so it comes back on.

 

5 5 is all clear.

 

ensure that you put the screw back to its original setting when you reset it last time..