Question about 2002 Pontiac Grand Prix
I would hope that's all there is to it but I've been driving it for several hundred miles between emissions tests. I believe the ECU isn't resetting like it should. I've replaced the usual suspects like O2 sensors, Spark plugs (all 6), cleaned EGR valve and even cleaned the engine!! Any other advice??
Posted on Dec 11, 2009
Nope, you just need more miles. When the car's computer has been disconnected from power (such as when the battery is unhooked), it'll set what are called "readiness codes" when power is reapplied. It takes a certain number of miles to clear these - some cars require 50 miles, some 100 miles, and some (such as some Isuzu models) need very specific drive cycles to clear them. Once the requisite number of miles have been driven without issues, the readiness codes will extinguish and your car should pass.
Posted on Dec 10, 2009
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Posted on Jan 02, 2017
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