Mass or Volume Air Flow Circuit Range/Performance Problem
Plain-English meaning
The engine control module (ECM) has detected that the mass air flow (MAF) sensor signal is outside the expected range or is inconsistent with other sensor inputs.
What to check first
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What not to replace yet
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Stop driving when
If the vehicle exhibits severe stalling, loss of power while driving, or unsafe handling, stop driving and seek professional assistance.
Related symptoms
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Owner steps
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Likely causes
Dirty or contaminated MAF sensor (medium)
Faulty MAF sensor (medium)
Air leaks in the intake system (medium)
Faulty or damaged wiring/connectors in MAF circuit (medium)
Clogged or dirty air filter (medium)
Vacuum leaks (medium)
Faulty throttle body (medium)
Shop steps
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Follow-up questions
Has the air filter been replaced or inspected recently?
Are there any other diagnostic trouble codes present?
Is the Check Engine Light steady or flashing?
Have you noticed any recent changes in engine performance or fuel economy?
Has the vehicle been exposed to water or contaminants near the MAF sensor?