How to read 1991 ford engine codes7/6/2023 Steady Check Engine Light: If your check engine light is on every time you operate your Mustang, you need to have it checked as soon as possible, especially if you notice performance problems or unusual noises. For example, does it happen when you accelerating, driving on the highway or does it appear at low speeds? This will help your mechanic evaluate the issue. Intermittent Check Engine Light: If the check engine light on your 1991 Mustang is intermittent, try to take note of the conditions when this happens. The video above shows how to locate the on board diagnostics (OBD) plug on your 1991 Mustang, how to read the trouble codes and how to reset or clear the check engine light using a scanner on your Mustang. In some cases you need to pull over immediately to prevent damage while in others you merely need to tighten you gas cap next time you stop in order to reset the service engine soon light. A check engine light can indicate a broad spectrum of problems with your 1991 Ford Mustang.
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