That Check Engine light can mean so many different things, as can any noticeable difference in your car’s performance or weird sounds. Fortunately, there are ways to narrow down the problem using tools like an OBD2 scanner (short for On-Board Diagnostic) and knowing where to find your vehicle’s OBD ports, but a more accurate diagnosis is only part of the process. Once you have an engine code to work from — in this case, code P0171 — you still
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