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How do I know if my mass airflow sensor is bad?

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How do I know if my mass airflow sensor is bad?

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P0102 \u2013 Mass or Volume Air Flow Circuit Low Input. P0102 is an OBDII trouble code indicating that the mass air flow sensor (MAF) is reporting inaccurate values. ... A MAF that is reading too low will then result in not enough fuel being injected, and as a result the engine would be operating in a lean condition.

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