P0101
Medium severityMass Air Flow (MAF) Circuit Range/Performance
Quick answer
P0101 (Mass Air Flow (MAF) Circuit Range/Performance) means: The mass-airflow sensor reading is outside the expected range for current conditions. Diagnose soon; cleaning the MAF or replacing the air filter often helps. Typical Malaysia repair cost: RM200–RM800 (approximate).
Symptoms
- •Hesitation
- •Rough idle
- •Reduced economy
- •Check engine light
Likely causes
- •Dirty or failing MAF sensor
- •Intake/vacuum leak
- •Dirty air filter
- •Wiring fault
Can I drive?
Diagnose soon; cleaning the MAF or replacing the air filter often helps.
Estimated repair cost (Malaysia)
RM200–RM800 (approximate)
Diagnostic guide (for mechanics)
Work through these in order — cheapest and safest checks first, before replacing expensive parts.
1. Inspect for intake leaks after the MAF
An unmetered air leak between the MAF and throttle skews the reading. Check the intake boot and clamps.
Test: Visual/feel for cracks; watch idle while flexing the boot.
Expected: No idle change, no visible cracks.
2. Clean and re-read the MAF
A contaminated MAF reports implausible airflow. Clean with MAF-specific cleaner only.
Test: Live data MAF g/s at idle and at 2500 rpm.
Expected: Smoothly rising, plausible airflow (no flat or spiky signal).
3. Compare against calculated load
Cross-check MAF against engine load and RPM to judge plausibility before replacing.
Test: Live data: MAF vs calculated load.
Expected: Values track together sensibly.
Tools: OBD-II scan tool · MAF cleaner
When to escalate: If airflow stays implausible after cleaning and leaks are ruled out, replace the MAF and re-verify.
This is general information, not a diagnosis. AutoMalaya OBD helps explain your car’s actual scan data; a qualified mechanic may still need to inspect the vehicle.