OBD2 code P0101: Mass or Volume Air Flow Sensor A Circuit Range/Performance
The mass air flow sensor (MAF) sits between the air filter and the throttle or compressor and measures how much air the engine draws in; fuel quantity, load and ignition are calcul
Detected Root Component
MAF Sensor
Technical Component Diagrams
MAF Sensor Layout
Diag Expert technical diagram
MAF Sensor Connector
Diag Expert technical diagram
Observed Symptoms
- Check engine light on, often without driveability problems
- Hesitation, flat spot, poor throttle response
- Rough idle or stalling
- Higher consumption, often with lean codes P0171/P0174
Possible Causes
- Air leak between sensor and engine (cracked or loose intake duct, boost leak)
- Contaminated sensing element (oil from oiled sport filter, dust)
- Leaking or disconnected crankcase ventilation
- Clogged or wrongly fitted air filter, modified intake
- Aged sensor or poor contact in the wiring
Tools Required
Interactive Diagnostic
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Parts likely to be the cause (Capteur MAF / Débitmètre)
Capteur MAF / Débitmètre
Photo d'illustration : Capteur MAF / Débitmètre
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Frequently asked questions about code P0101
What does code P0101 mean? ▾
OBD2 code P0101: Mass or Volume Air Flow Sensor A Circuit Range/Performance. The mass air flow sensor (MAF) sits between the air filter and the throttle or compressor and measures how much air the engine draws in; fuel quantity, load and ignition are calcul
What are the symptoms of code P0101? ▾
Code P0101 may cause: Check engine light on, often without driveability problems, Hesitation, flat spot, poor throttle response, Rough idle or stalling, Higher consumption, often with lean codes P0171/P0174. The intensity of these symptoms varies depending on the vehicle and driving conditions.
What causes code P0101? ▾
The most common causes of code P0101 are: Air leak between sensor and engine (cracked or loose intake duct, boost leak), Contaminated sensing element (oil from oiled sport filter, dust), Leaking or disconnected crankcase ventilation, Clogged or wrongly fitted air filter, modified intake. A proper OBD2 diagnostic will pinpoint the exact cause.
Is it serious to drive with code P0101? ▾
Code P0101 has moderate severity (Warning). Short-term driving remains possible, but a prompt check is recommended to prevent worsening.
How do I fix code P0101? ▾
Start by reading the code with an OBD2 scanner, then follow the interactive decision tree on this page. Priority causes to check: Air leak between sensor and engine (cracked or loose intake duct, boost leak), Contaminated sensing element (oil from oiled sport filter, dust), Leaking or disconnected crankcase ventilation, Clogged or wrongly fitted air filter, modified intake. Difficulty: Medium · Estimated time: 30-60min.