P0101 — Mass or Volume Air Flow "A" Circuit Range/Performance Problem
Category: Powertrain Severity: Medium
Updated:
DTC code P0101 means: Mass or Volume Air Flow "A" Circuit Range/Performance Problem. It falls under the "Powertrain" category, with an estimated severity of Medium. Common causes include dirty or faulty MAF sensor, intake air / vacuum leak and clogged air filter; it's worth confirming the diagnosis before replacing parts.
Possible causes
- Dirty or faulty MAF sensor
- Intake air / vacuum leak
- Clogged air filter
- Faulty MAF wiring or connector
Symptoms
- Loss of power when accelerating
- Unstable idle
- Higher fuel consumption
- Jerking while driving
How to diagnose it step by step
- Check the air filter and intake duct.
- Clean the MAF with dedicated cleaner (never touch it).
- Look for air leaks after the MAF.
- Compare airflow (g/s) with the expected value for the engine size.
- Replace the MAF if it's still out of range.
How to fix it
Clean or replace the MAF/MAP sensor and check for intake leaks.
Estimated repair cost
Cleaning: $20–70. MAF: $100–300.
Frequently asked questions
What does DTC code P0101 mean?
Mass or Volume Air Flow "A" Circuit Range/Performance Problem.
Is code P0101 serious?
Severity Medium. Not urgent, but worth diagnosing to avoid bigger damage.
Can I keep driving with code P0101?
Yes, carefully; the engine may hesitate or use more fuel.
Related codes
P0102 P0103 P0106 P0107 P0108 P0110 P0112 P0113 P0115 P0116
Refine by car make
- Audi P0101: Dirty mass air flow (MAF) sensor.
- BMW P0101: MAF sensor or intake leak.
- Citroën P0101: MAF sensor or intake leak.
- Dacia P0101: MAF/MAP sensor.
- Fiat P0101: MAF sensor or leak.
- Ford P0101: Dirty MAF sensor or intake leaks.
- Honda P0101: MAF/MAP sensor.
- Hyundai P0101: Dirty MAF sensor.
- Kia P0101: Dirty MAF sensor.
- Mazda P0101: Dirty MAF sensor.
- Mercedes-Benz P0101: MAF sensor or intake leak.
- Nissan P0101: Dirty MAF sensor.
- Opel P0101: MAF sensor or intake leak.
- Peugeot P0101: MAF sensor or intake leak.
- Renault P0101: MAF sensor or leaks in the intake circuit.
- Toyota P0101: Dirty MAF sensor or vacuum leak.
- Volkswagen P0101: Dirty mass air flow (MAF) sensor or intake leak.
- Volvo P0101: MAF sensor.
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