how do you think a check engine light would effect a car well it was being tuned. had my car tuned a week ago and was told that the car was not responding. and come to find out that the light was on the whole time, but the shop would not of known that because I had my check engine light cut. It was suppose to be fixed but wasent properly fixed so when they were dynoing the car the light was on but they would not of known.
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