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The code 0171 on a 2003 Ford Expedition typically refers to a diagnostic trouble code (DTC) for "System Too Lean (Bank 1)." This indicates that the engine control module has detected that the air-fuel mixture is too lean, meaning there is too much air and not enough fuel in the combustion process. Common causes can include vacuum leaks, faulty mass airflow sensors, or fuel delivery issues. It’s advisable to perform further diagnostics to identify the specific cause.
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