P0104 - Mass or Volume Air Flow Circuit Intermittent

The mass air flow sensor signal is intermittent or unstable.

Treat the code as the starting point: compare symptoms, likely causes, and repair paths before pricing parts or moving into an estimate.

Code Overview

The mass air flow sensor signal is intermittent or unstable.

Common Causes

• Dirty or failing mass air flow sensor
• Loose connector or poor terminal contact
• Damaged wiring causing signal dropouts
• Air leak or intake turbulence affecting the reading

Symptoms

• Intermittent hesitation or stumble
• Idle quality changes that come and go
• Unstable airflow readings on the scan tool

Diagnostic Steps

1. Wiggle-test the MAF connector and harness while watching live data
2. Inspect and clean the MAF sensor with MAF-safe cleaner if appropriate
3. Check intake ducting, clamps, and boots for leaks or poor fitment
4. Look for signal dropouts on the scan tool before replacing parts

Repair Difficulty

Moderate

General difficulty estimate for the most common repair path.

Likely Repairs & Cost Guides

Use symptoms, scan data, and quick checks to confirm the likely repair path before pricing parts. The estimator helps compare repair paths before replacing anything unnecessarily.

Related OBD Codes

Browse nearby code-family pages when the same fault pattern overlaps across systems, such as misfire, lean fuel trim, EVAP sealing, cooling, or charging faults.

Next Steps

Move from code lookup to diagnosis, then estimate the likely repair only after symptoms, causes, and checks point to the same path.