Use FIXD to scan your Ford to verify P0171 is the only code present.Reading and analyzing fuel trims and the freeze frame data is the key to properly diagnosing P0171. Many people will replace the air fuel sensor or O2 sensor as soon as they get a bad reading, but the root cause is often a dirty or faulty mass air flow sensor or vacuum leak, thus causing the O2 or A/F sensor to read differently to compensate. It is important to complete the entire diagnostic process when diagnosing P0171. Ford Code P0171 Common Diagnosis Mistakes
It is okay to drive your Ford with P0171 for a short period of time, but driving with this code for an extended period of time can overheat the engine and cause internal engine damage. Vacuum leaks – PCV hose, vacuum hoses, intake manifold gasket.When these adjustments become too large, code P0171 is triggered. To keep your Ford 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. When there are more than 14.7 parts air to 1 part fuel in the air-fuel mixture, a lean condition exists and code P0171 is triggered. What Does P0171 Mean For Your Ford?Ĭombustion engines run most efficiently when they maintain an air-fuel mixture ratio of 14.7 parts air to 1 part fuel.
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