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Fault code guide

P0101: Mass or Volume Air Flow Sensor A Circuit Range/Performance

Plain English for owners who are not mechanics. We show where each answer comes from, and we say so when it is not known.

What the dictionary says

Mass or Volume Air Flow Sensor A Circuit Range/Performance

Source: generic entry in the MIT-licensed dtc-database · view source file

P0101 is a generic OBD fault code. The fault-code dictionary we use defines it as "Mass or Volume Air Flow Sensor A Circuit Range/Performance". Below: the source entry, manufacturer entries, related codes and the terms explained.

Manufacturer entries in the dictionary

  • Audi

    Large vacuum leaks, Split Intake Air Boot or PCV Hose, Defective intake manifold gaskets, Mass Airflow Sensor (MAF), Mass Air Flow Sensor circuit and or wiring problems, Defective Barometric Pressure Sensor, Dirty or contaminated Mass Air Flow Sensing wire or filament, PCM software needs to be updated

    Source file · Listed as written in this source file. Not ranked; a workshop must confirm what applies to your car.

Reading the code P0101

  • First character: P: Powertrain (engine, transmission and ignition)
  • Second character: 0: a generic code defined by SAE, meant to mean the same thing on every make
  • Last three characters: 101: The specific fault within that category.

Reference: On-board diagnostics (Wikipedia)

Terms in this code

  • Mass air flow (MAF) sensor: A sensor that measures the mass of air entering a fuel-injected engine. More

Related codes

  • P0100 Mass or Volume Air Flow Sensor A Circuit
  • P0102 Mass or Volume Air Flow Sensor A Circuit Low
  • P0103 Mass or Volume Air Flow Sensor A Circuit High
  • P0171 System Too Lean Bank 1

Singapore notes

LTA's periodic inspection checks a car's exhaust emissions and noise against the prevailing standards, as well as brakes, steering, lights and structure. Cars under 3 years old have no periodic inspection, cars aged 3 to 10 years are inspected every 2 years, and cars over 10 years every year. The dictionary does not say how this code affects an inspection, so ask the inspection centre or a workshop. LTA: vehicle inspection

Need a workshop? See workshops owners recommend or the Subaru list.

What this page does not tell you

The dictionary does not establish repair costs, how likely each cause is, or whether the car is safe to drive. Get a workshop diagnosis and a written quote before paying for parts.

For a make-specific answer, use the lookup below with your make and model. The dictionary has 93 Subaru-specific entries among 18,805 in total.

Look up P0101 for your car

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