P0102: Mass Airflow Sensor Circuit Low Input
P0102 = MAF sensor is reporting less air than expected. A can of MAF-safe cleaner and a fresh air filter clear this code more often than any other fix.
Severity: moderate · System: Powertrain · Safe to drive: usually, short-term. Not immediately dangerous. Clean the MAF first — the fix is often literally $10 of MAF cleaner.
Symptoms
- Loss of power
- Rough idle
- Poor MPG
- Hesitation
Common causes
- Dirty MAF sensor
- Air filter blocked
- Wiring / connector issue
Fair repair prices
| MAF sensor cleaning | $15–$60 |
|---|---|
| Air filter replacement | $25–$90 |
| MAF sensor replacement | $200–$400 |
Ranges are US market averages (parts and labor). If your shop's quote is above the high end, ask for a line-item breakdown or run it through the invoice checker.
Other codes
- P0300 — Random / Multiple Cylinder Misfire Detected
- P0301 — Cylinder 1 Misfire Detected
- P0420 — Catalyst System Efficiency Below Threshold (Bank 1)
- P0430 — Catalyst System Efficiency Below Threshold (Bank 2)
- P0171 — System Too Lean (Bank 1)
- P0174 — System Too Lean (Bank 2)
- P0442 — Evaporative Emission Control System Leak (Small)
- P0455 — Evaporative Emission Control System Leak (Large)