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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