Cool 2004 Pontiac Grand Prix Check Engine Light Came On Ideas. You can diagnose the problem yourself by buying an obd ii scanner and check the engine codes. Web i have a 2004 pontiac grand prix gt and my engine service light came on.
Is this most likely a connection problem or a bad sensor? It went off for half a day,now its back on. A check engine light can indicate a broad spectrum of problems with your 2004 pontiac grand prix.
