P1083 on BMW
Fuel Control Mixture Lean, Bank 1 Sensor 1 (manufacturer-specific, common on BMW)
P1083 on BMW vehicles indicates fuel control mixture lean, bank 1 sensor 1 (manufacturer-specific, common on bmw). Au7o has documented this code across 1 BMW model — most commonly on M5. P1083 is a manufacturer-specific powertrain code, most commonly seen on BMW, indicating a lean fuel/air mixture on bank 1 (the side with cylinder 1), as measured by the upstream oxygen sensor. The engine computer found it had to add fuel beyond its normal range to compensate for extra unmetered air, meaning the mixture is too lean. It frequently appears alongside P1085 and the generic lean codes P0171/P0174, and most often points to an air leak after the mass-airflow sensor. Typical repair costs on BMW range from $300 to $900, depending on the specific model and root cause.
Common Causes of P1083
- •Vacuum or intake leak after the MAF sensor
- •Failed crankcase ventilation (CCV) valve or hoses (BMW)
- •Dirty or faulty mass airflow (MAF) sensor
- •Leaking or cracked intake boot/manifold gaskets
- •Weak fuel pump or clogged fuel injectors
- •Faulty upstream oxygen (O2) sensor
- •Leaking PCV/oil filler/dipstick seal allowing unmetered air
P1083 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 P1083 across all makes →Frequently Asked Questions
What does P1083 mean on BMW?▼
P1083 stands for "Fuel Control Mixture Lean, Bank 1 Sensor 1 (manufacturer-specific, common on BMW)." P1083 is a manufacturer-specific powertrain code, most commonly seen on BMW, indicating a lean fuel/air mixture on bank 1 (the side with cylinder 1), as measured by the upstream oxygen sensor. The engine computer found it had to add fuel beyond its normal range to compensate for extra unmetered air, meaning the mixture is too lean. It frequently appears alongside P1085 and the generic lean codes P0171/P0174, and most often points to an air leak after the mass-airflow sensor. On BMW specifically, this code is documented across 1 model.
What causes P1083 on BMW vehicles?▼
Common causes on BMW: Vacuum or intake leak after the MAF sensor, Failed crankcase ventilation (CCV) valve or hoses (BMW), Dirty or faulty mass airflow (MAF) sensor, Leaking or cracked intake boot/manifold gaskets, Weak fuel pump or clogged fuel injectors. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix P1083 on a BMW?▼
Repair costs on BMW range from $300 to $900, depending on the specific model and root cause.
Which BMW models have P1083 documented?▼
Au7o has documented P1083 on 1 BMW model: M5.