Anyone who wants to save should have one of these. Most engine gauges refer to a simple emissions-related code. This happens all the time due to a loose gas cap or some other simple problem. The system will show you all the codes and the book will explain what they are. After that, you can decide if you want to bring the car in for service based on the problem. It costs less than 1 trip to the gas station. It has already saved me over $300 on my car.
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