I could use a bit of advice. I have a 99 Pontiac Grand Prix with 38000
Supercharged engine. The check engine light came on with code P0102
MAF Circuit Low Input. I bench tested the MAF sensor. It varied the
output voltage signal, but not by much. I purchased a new MAF sensor
and bench tested it as well for comparission. It varied the voltage
signal by significantly more. I thought I had found the problem. I
installed the new MAF sensor. Then I disconnected the battery to clear
the old code, reconnected the battery, and then started the car. The
Check Engine Light is still on. What else should I be looking at? Any
other advice appreciated? Thanks in advance
I don't believe disconnecting the battery will clear the codes on that car.
I would run it to a local parts store and see if they'll clear the code for
free. If that still doesn't fix the problem check your fuel filter out.
Have you replaced that yet?
Thanks for the good advice. I was finally able to get the error codes
cleared. I tried disconnecting both positive AND negative battery cables.
Previously I had just disconnected positive cable and let the car sit for
about 15 minutes. Upon reconnecting and starting up, the check engine light
finally stayed off. Not sure if it was a matter of both cables being
disconnected, or I had read that some models require three good starts
before self clearing a condition code.
It doesn't matter if you remove one or both cables. In the future for safety
reasons ALWAYS remove the negative cable before removing the positive. If
the wrench touches any part of the car while removing the Pos cable with the
negative still attached you will get severe burns from the wrench welding
itself to the car....
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