I was driving home when the check engine light came on. I stopped at the auto parts store, and they used an OBD2 reader to check the problem. What could cause the light to come on, and how can I fix it?
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Hey Mason,
Ford trouble code P0171 indicates that the engine’s air-fuel mixture is too lean, meaning there is too much air and not enough fuel in the mixture. This can be caused by a vacuum leak, faulty sensors, or fuel system issues.
A P0171 code indicates that your vehicle’s fuel system is running weakly or that there is a vacuum leak near the engine. This means that the engine’s air-fuel mixture is too lean, and your vehicle’s Bank 1 is either depleted or overfilled.