Leaderboard

I did look in my '90 FSM and the three missing codes, 033, 052 and 061, do not appear there either?? I think I may have seen E061 myself at some point but it isn't in my manual.

I have looked around a bit online as well and I found conflicting information for GM OBD1 codes but 061 appears in more than one place as referring to the O2 sensor being sluggish/contaminated. The other that had multiple references is 033 = MAF. One reference to 052 being CALPAK fault. Part of the issue is OBD1 can be manufacturer and even car model specific so it may vary even between model years for the same vehicle. I will see if I can fill in the missing codes from my FSM for a '90.