Question about 2002 Pontiac Grand Prix

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My 2002 Grand Prix GT 3.8L Won't pass emissions. Testing center's scanner says car was recently worked on and that the mileage driven since is not enough to recycle check engine light. The ck eng. light has not come up in over a year. The light bulb is good. Since then we have had the engine scanned and no codes are showing up. Emissions test performed a 2nd time and again failed for same reason. Could the ECU possibly be bad? Any help would be appreciated.... About to pull my hair out!

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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

  • Lawrencej61 Aug 27, 2011

    did you fox the car, if so do tell me what you done

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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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