B3749
Air Flow Control 7 Feedback Circuit Performance
B3749 is an OBD-II diagnostic trouble code meaning: Air Flow Control 7 Feedback Circuit Performance. Common causes: malfunction of the mass air flow sensor (maf), wiring harness damage. Estimated repair cost: $56–167.
Symptoms
- Unstable engine operation
- Increased fuel consumption
- Reduced engine power
- Check engine light comes on
Causes
- Malfunction of the mass air flow sensor (MAF)
- Wiring harness damage
- Engine control unit malfunction
- Throttle valve contamination
How to Fix
- Check the mass air flow sensor (MAF)
- Inspect the wiring harness for damage
- Check the operation of the engine control unit
- Clean throttle body
Related codes
Error B3749 by Vehicle Brand
FAQ
What does the B3749 code mean?
B3749 is an OBD-II diagnostic trouble code that indicates: Air Flow Control 7 Feedback Circuit Performance
What causes a B3749 error code?
The most common causes of B3749 include: Malfunction of the mass air flow sensor (MAF); Wiring harness damage; Engine control unit malfunction; Throttle valve contamination.
How do I fix a B3749 diagnostic trouble code?
To fix B3749: Check the mass air flow sensor (MAF). Inspect the wiring harness for damage. Check the operation of the engine control unit. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with B3749?
Limited driving only, diagnose soon
How much does it cost to fix B3749?
The estimated repair cost for B3749 is $56–167. Actual cost depends on your vehicle, location, and labor rates.
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