EngineModerate✅ DIY Friendly

P0104

Q: What does OBD2 code P0104 mean?

P0104 means: Mass Air Flow Circuit Intermittent. MAF sensor signal drops in and out intermittently.

Mass Air Flow Circuit Intermittent

MAF sensor signal drops in and out intermittently.

SeverityModerate

CategoryEngine

Est. Repair Cost$50–$300

Code TypePowertrain

DIY RepairYes

⚡ Common Causes

›Loose MAF sensor connector
›Damaged wiring harness
›Failing MAF sensor
›Vibration-related connection issue

⚠️ Symptoms

›Intermittent stalling
›Random hesitation
›Occasional rough idle
›Check engine light comes and goes

✅ How to Fix — Step by Step

Step 1:Clean and reseat MAF connector
Step 2:Inspect wiring for chafing
Step 3:Wiggle test wiring while monitoring live data
Step 4:Replace MAF sensor

🔧 Diagnostic Tools Required

✔OBD-II Diagnostic Scanner
✔Digital Multimeter
✔Fuel Pressure Gauge
✔Compression Tester
✔Spark Tester

Using the correct diagnostic tools helps identify the root cause of P0104 before replacing parts unnecessarily. Always confirm the fault using live data and manufacturer-recommended diagnostic procedures.

💡 Pro Tip: Wiggle the wiring harness while watching live MAF data — intermittent faults often reveal themselves this way.

Frequently Asked Questions

What does OBD2 code P0104 mean?+

P0104 stands for Mass Air Flow Circuit Intermittent. MAF sensor signal drops in and out intermittently.

What causes code P0104?+

Loose MAF sensor connector; Damaged wiring harness; Failing MAF sensor; Vibration-related connection issue

How do I fix code P0104?+

Clean and reseat MAF connector; Inspect wiring for chafing; Wiggle test wiring while monitoring live data; Replace MAF sensor

How much does it cost to fix P0104?+

Estimated repair cost for P0104 is $50–$300.

Is P0104 DIY-friendly?+

Yes — P0104 is generally DIY-friendly with basic tools.