TorqueMech OBD Code Guide
P0104 - Mass or Volume Air Flow Circuit Intermittent
The mass air flow sensor signal is intermittent or unstable.
Code first. Confirm symptoms and checks before pricing parts.
Read code pattern
Check likely system
Estimate after confirmation
Explore Related Systems
Compare nearby repair families.
Common Next Steps
Turn the code into the next check.
Review fuel trims
Compare trims at idle, 2500 RPM, and cruise before pricing sensors.
Inspect vacuum leaks
Check intake boots, PCV hoses, and post-MAF leak paths.
Check MAF sensor
Inspect MAF contamination and airflow data after intake leaks are considered.
Inspect intake tubing
Look for cracked ducts, loose clamps, and unmetered air after the MAF.
Related Inspection
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
- Wiggle-test the MAF connector and harness while watching live data
- Inspect and clean the MAF sensor with MAF-safe cleaner if appropriate
- Check intake ducting, clamps, and boots for leaks or poor fitment
- Look for signal dropouts on the scan tool before replacing parts
Repair Difficulty
Moderate
General difficulty estimate for the most common repair path.
Related OBD Codes
Browse nearby codes when systems overlap.
Next Steps
Move from code to checks, then estimate.