I Have A 2004 Pontiac Grand Prix It's Light Still On I've Changed Spark Plug's And Wires What's Wrong Still?

If you are talking abut the service engine light being on, then a tune up will not cure the problem. There is a code stored in the computer nad a sensor is giving a problem. You need to have a scan ran on the vehicle to locate the sensor or problem in order to fix it. PepBoys and other auto repair shops can do this scan for $35.00 to $50.00 and find the problem.

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