Common Symptoms
- Check Engine Light illuminated
- Rough idle or engine stumbling
- Poor fuel economy
- Black smoke from exhaust under acceleration
- Engine hesitation or lack of power
- Hard starting or stalling
Most Likely Root Causes
- Contaminated or dirty MAF sensor element
- Damaged or cracked air intake boot or ductwork
- Faulty MAF sensor
- Damaged or corroded wiring harness or connector at MAF sensor
- Vacuum leak downstream of MAF sensor
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Component Location
The MAF sensor is located in the air intake duct between the air filter housing and the throttle body.
Manufacturer Notes
Some manufacturers recommend replacing the air filter and cleaning the MAF sensor before replacing the sensor itself when this code appears.
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Heavy-duty trucks often throw both OBD-II and J1939 faults simultaneously. AI Diesel Tech handles both protocols in a single guided session.
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