P0101 on BMW
Mass or Volume Air Flow Sensor Circuit Range/Performance
P0101 on BMW vehicles indicates mass or volume air flow sensor circuit range/performance. Au7o has documented this code across 1 BMW model — most commonly on M5. 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. Typical repair costs on BMW range from $300 to $900, depending on the specific model and root cause.
Common Causes of P0101
- •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
P0101 on BMW by Model
BMW M5(1 issue)
- MAF Sensor Degradation Causing Lean Codes, Hesitation, and Reduced Power2000-2003
The S62 uses dual mass-airflow sensors, and aging or contaminated MAFs are a recurring E39 M5 issue. Owners commonly report rough idle, hesitation, poor throttle response, reduced power, and check-engine lights with mixture adaptation faults. BMW service literature and independent repair databases frequently reference diagnosis of intake leaks versus faulty MAF readings on E39 V8 applications.
Looking for P0101 on a different make?
View P0101 across all makes →Frequently Asked Questions
What does P0101 mean on BMW?▼
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. On BMW specifically, this code is documented across 1 model.
What causes P0101 on BMW vehicles?▼
Common causes on BMW: 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. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix P0101 on a BMW?▼
Repair costs on BMW range from $300 to $900, depending on the specific model and root cause.
Which BMW models have P0101 documented?▼
Au7o has documented P0101 on 1 BMW model: M5.