Q: Is it possible to diagnose a problem if there is no error message when a diagnostic is run on a car?

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My car lost power, but did not stall. I turned it off and then on again. The check engine light in so longer on, so the diagnostic showed no error messages. Is it possible to diagnose the problem?

Generally, the code will remain stored in the computer and may reappear. The check engine light comes on when something fairly serious is going on with the vehicle. This can happen for many different reasons such as a faulty mass air flow sensor, a faulty O2 sensor, a bad catalytic converter, bad spark plugs or spark plug wires and many other reasons. Due to the wide range of possibilities for the check engine light to come on, the best and most efficient way to narrow down the scope of what may be causing this is to have the vehicle hooked up to a scanning tool to download any potential fault codes that may have registered in the computer. This will allow a mechanic to determine more specifically what to look for in diagnosing your vehicle. I would recommend having an expert from YourMechanic come to your location to take a look at your vehicle to determine what may be causing your check engine light to come on.

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