Visit our guide on how to use the FIXD scanner and app’s live data function to literally talk to your car when diagnosing most check engine light problems. Using the live data function of the FIXD sensor and app allows you to read and analyze fuel trims to properly diagnose a P0171 code. With a P0171 code, the first step is to get it properly diagnosed to figure out what is causing the engine to run lean. Commonly associated with error codes: P0174.Vacuum leaks – PCV hoses, vacuum hoses, intake manifold gasket.When these adjustments become too large, the P0171 code is triggered. To keep the engine running properly, the powertrain control module (PCM) tries to compensate for the lean condition by injecting more fuel to the mixture in an effort to maintain the proper 14.7:1 ratio. The lean condition can be caused by a vacuum leak, which introduces more air into the air-fuel mixture, or by a weak fuel system, which does not input enough fuel into the air-fuel mixture. Too much fuel and/or too little air results in the engine running rich setting a P0172 trouble code (read more about it in our guide here), while too little fuel and/or too much air results in the engine running lean resulting in a check engine light for the P0171 code. Visit our comprehensive guide on mass airflow sensors to learn more about how they work.Ĭombustion engines run most efficiently when they maintain an air-fuel mixture ratio of 14.7 parts air to 1 part fuel. Many people will replace the air-fuel sensor or oxygen sensor as soon as they get a bad reading, but the root cause can also be a dirty or faulty mass airflow sensor or vacuum leak, thus causing the O2 or MAF sensor to read differently to compensate. Diagnosis: It is important to complete the entire diagnostic process when diagnosing P0171.Repair Urgency: Get this code fixed as soon as possible to avoid damage to spark plugs, pistons, and catalytic converters.Issue Severity: MODERATE– Extended driving with this code can cause internal engine damage.P0171 definition : Bank 1 has too much air or not enough fuel.
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