it works very well. My mother's old car had sat for a while and she decided to sell it, but the check engine light was on. We used this to "decode" that it was related to the oil change. After changing the oil we were able to remove the code. Even with the purchase price for it and the oil ($15.99) it's still a lot cheaper than going to a mechanic. good to keep in the car when the check engine light is on in my own car.
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