P0102 on BMW
Mass or Volume Air Flow Sensor Circuit Low Input
P0102 on BMW vehicles indicates mass or volume air flow sensor circuit low input. Au7o has documented this code across 1 BMW model — most commonly on M5. P0102 is a generic OBD-II code meaning the engine computer detected an abnormally low voltage or signal from the Mass Air Flow (MAF) sensor circuit. The MAF sensor measures how much air is entering the engine so the computer can deliver the correct amount of fuel. A low signal tells the computer it is reading less airflow than is actually present, which can cause poor running, stalling, or reduced power. While not usually an emergency, it can affect drivability and fuel economy and should be addressed. Typical repair costs on BMW range from $300 to $900, depending on the specific model and root cause.
Common Causes of P0102
- •Dirty or contaminated MAF sensor element
- •Faulty MAF sensor
- •Damaged, corroded, or loose MAF connector/wiring
- •Open or short to ground in the signal or power circuit
- •Dirty or restricted air filter / intake blockage
- •Vacuum or intake air leak after the sensor
- •Poor power or ground supply to the sensor
P0102 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.
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View P0102 across all makes →Frequently Asked Questions
What does P0102 mean on BMW?▼
P0102 stands for "Mass or Volume Air Flow Sensor Circuit Low Input." P0102 is a generic OBD-II code meaning the engine computer detected an abnormally low voltage or signal from the Mass Air Flow (MAF) sensor circuit. The MAF sensor measures how much air is entering the engine so the computer can deliver the correct amount of fuel. A low signal tells the computer it is reading less airflow than is actually present, which can cause poor running, stalling, or reduced power. While not usually an emergency, it can affect drivability and fuel economy and should be addressed. On BMW specifically, this code is documented across 1 model.
What causes P0102 on BMW vehicles?▼
Common causes on BMW: Dirty or contaminated MAF sensor element, Faulty MAF sensor, Damaged, corroded, or loose MAF connector/wiring, Open or short to ground in the signal or power circuit, Dirty or restricted air filter / intake blockage. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix P0102 on a BMW?▼
Repair costs on BMW range from $300 to $900, depending on the specific model and root cause.
Which BMW models have P0102 documented?▼
Au7o has documented P0102 on 1 BMW model: M5.