Ok i was driving back from work today in my GTA on the freeway at a steady 70-75 mph pace and after a while my SES light came on. I kinda figured it was a code 32 (EGR) since these cars have a tendency to do that during highway cruising so i didn't pay it much attention. So anyway i got home and went to pull the code just to be sure. Of course it spit out a code 32 but then it spit out a code 33. Code 33 is an map sensor code. MY CAR DOESN'T HAVE AN MAP SENSOR! Its an 88 350 tpi engine so its an maf system. I checked it again just to make sure i wasn't seeing things but it sure was a code 33? Whats going on here? Do i possibly have a bad ecm or something along that order?

 

No, the ECM isn't going bonkers. The code 33 on the MAF cars indicates that the voltage from the MAF sensor was high.