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OBD code P0172 indicates that the engine control module (ECM) has detected a rich fuel condition, meaning there is too much fuel or not enough air in the air-fuel mixture. Common causes include a malfunctioning fuel injector, a faulty mass air flow (MAF) sensor, a clogged air filter, or issues with the fuel pressure regulator. Additionally, vacuum leaks or problems with the exhaust system can contribute to this rich condition. Proper diagnosis is essential to identify the specific cause in a given vehicle.
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p0172
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