P0101: Mass or Volume Air Flow Sensor Circuit Range/Performance
10 vehicles · 7 makes · $10-$2,500 repair
Most Reported On
P0101 is an OBD-II diagnostic trouble code meaning “Mass or Volume Air Flow Sensor Circuit Range/Performance.” This powertrain code means the mass air flow (MAF) sensor's reading is out of the expected range or not changing as it should compared to other engine data. The MAF sensor measures how much air enters the engine so the computer can calculate the correct fuel amount. When the reported airflow doesn't match expectations, the air-fuel mixture can be off, causing rough running, hesitation, stalling, or poor fuel economy. It is usually not an emergency but should be fixed for proper performance and emissions. This code is most commonly reported on 2007-2019 Nissan Versa, 2018-2021 Chevrolet Equinox (L, LS, LT), and 2000-2003 BMW M5, plus 7 other vehicles, with repair costs ranging from $10 to $2,500.
Common Causes
Typical Repair Cost
Based on 11 documented vehicle-specific issues. Actual cost depends on root cause and vehicle.
Diagnostic Tools
To diagnose P0101, you'll need an OBD-II scanner. Here are our recommendations at every price point.
ANCEL AD310 Classic OBD-II Scanner
by ANCEL
A simple, affordable code reader that reads and clears check engine codes. Great for quick diagnostics on any OBD-II vehicle (1996+).
- Read & clear engine codes
- View freeze frame data
- I/M readiness status
- No batteries or app needed
BlueDriver Pro Bluetooth Scanner
by BlueDriver
Bluetooth OBD-II scanner with a free companion app. Provides enhanced diagnostics, smog readiness, and repair reports sourced from a database of verified fixes.
- Enhanced diagnostics (ABS, SRS, transmission)
- Repair Reports with verified fixes
- Smog check readiness
- Free app (iOS & Android)
LAUNCH CRP123X OBD-II Scanner
by LAUNCH
A professional-grade handheld scanner that reads all four major systems (engine, transmission, ABS, SRS) with live data streaming and graphing.
- Engine, transmission, ABS, SRS diagnostics
- Live data stream & graphing
- AutoVIN for vehicle identification
- Free lifetime updates via Wi-Fi
Autel MaxiCOM MK808S Diagnostic Tool
by Autel
Shop-level diagnostic tablet with bi-directional control, active tests, and full system coverage. Ideal for serious DIYers and small shops.
- All-system diagnostics (25+ modules)
- Bi-directional control & active tests
- Oil reset, EPB, BMS, TPMS, injector coding
- 7-inch touchscreen with Android OS
As an Amazon Associate, we earn from qualifying purchases. Prices are approximate and may vary.
Vehicles Affected (10)
1.5L turbo coolant loss / overheating (head gasket & intercooler condensation)
Intake Manifold Gasket Vacuum Leak (Rough Idle, Cold-Start Misfire, Lean Codes)
Turbo Wastegate Regulator Solenoid Failure Causing Overboost/Underboost and Reduced Engine Power
FAQ
What does P0101 mean?
P0101 stands for "Mass or Volume Air Flow Sensor Circuit Range/Performance." This powertrain code means the mass air flow (MAF) sensor's reading is out of the expected range or not changing as it should compared to other engine data. The MAF sensor measures how much air enters the engine so the computer can calculate the correct fuel amount. When the reported airflow doesn't match expectations, the air-fuel mixture can be off, causing rough running, hesitation, stalling, or poor fuel economy. It is usually not an emergency but should be fixed for proper performance and emissions.
What are the most common causes of P0101?
The most common causes of P0101 are: Dirty or contaminated MAF sensor element, Vacuum/intake air leak (unmetered air after the sensor), Loose, cracked, or torn intake air ducting, Dirty or clogged air filter, Faulty MAF sensor, Wiring or connector problems at the MAF sensor. The specific cause varies by vehicle.
How much does it cost to fix P0101?
Repair costs for P0101 range from $10 to $2,500, depending on the vehicle and root cause.
Which vehicles are affected by P0101?
Au7o has documented P0101 across 10 vehicle models from 7 manufacturers: BMW, Chevrolet, Nissan, Opel, Pontiac, Toyota, Volkswagen.
Sources (12)
- article11 Most Common Chevrolet Equinox Problems (Engine Patrol)
- ForumInternal head gasket failure and its signs (TerrainForum)
- articleChevy Equinox Engine Turbo Problems & Issues (Lemberg Law)
- articleEngine Stalling Due to Mass Air Flow/Crankshaft Position Sensor Failure: Pontiac Bonneville (149 reports)
- articlePontiac Bonneville: Bad Mass Airflow Sensor — Symptoms + P0101/P0102 (Drivetrain Resource)
- articleHow To Test The MAF Sensor (GM 3.8L V6 1996-2005, incl. Pontiac Bonneville) — P0101/P0102
- ForumSupercharged 3800 Series II with code P0102 (2001 Bonneville SSEi) — GM Inside News Forum
- ForumDriving me CRAZY — P0102 Mass Air Flow (MAF) Sensor Circuit Low Frequency — 3800Pro Forums
- Forum1.6cdti egr problems - Vauxhall Mokka Forums
- ForumP0101 MAF fault P0401 EGR - Vauxhall Mokka Forums
- ForumEGR Cooler cleaning or repair - Vauxhall Mokka Forums
- article2020 Nissan Kicks Engine Stalling: Causes & Repairs (RepairPal)
Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.