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+18 2004 Cadillac Check Engine Light 2023 . My wife pulled over and turned the ignition off then back on. In some vehicles, the light comes in two colors: HOW TO RESET ECM ON 2007 CADILLAC CTS YouTube from www.youtube.com Could this be just be the plugs? Web the average price of a 2004 cadillac xlr check engine light can vary depending on location. If so, you can do the f1&f6 thing to check it and reset it.