When I purchased the reader I was a bit skeptical as to whether it was going to help me find why my engine light came on. The unit is easy to hoopk up to the car and use. It gave me the error code and brief description of what the code meant. This allowed me to find my problem (a loose gas cap--Man these cars are sensitive these days!) and clear the code turning off the engine light.
Something to keep in mind with this or any other code reader and that is the code reader doesn't alway tell you exactly the problem with your car but can get you close. Having some knowledge of automotive systems (including the car's shop manual) is definitely helpful.
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