P1083 on 2000-2003 BMW M5 — Fuel Control Mixture Lean, Bank 1 Sensor 1 (manufacturer-specific, common on BMW)
1 vehicles · 1 makes · $300-$900 repair
How to diagnose and fix P1083: most-reported vehicles
Ranked by owner reports. Each card gives the symptoms, how to confirm the cause, the fix, parts and sources for that vehicle.
BMW M5 · 2000–2003
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.
Common Symptoms
- Check engine light
- Rough idle
- Hesitation on acceleration
- Reduced engine power
- Poor fuel economy
- Lean mixture faults
How to Fix
Scan for fuel-trim and MAF-related faults, inspect for intake leaks first, then compare live airflow values bank-to-bank. If readings are implausible or one bank differs significantly, replace the affected MAF sensor(s) with OE-quality parts and clear adaptations; also inspect intake boots and air filter condition.
Sources for this issue (1)
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P1083 code reference
General diagnostic-code context. The code alone does not confirm a cause for your vehicle; use the applicable issue card and its sources.
Frequently asked questions
What does P1083 mean?
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.
What are the most common causes of P1083?
The most common causes of P1083 are: 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. The specific cause varies by vehicle.
How much does it cost to fix P1083?
Repair costs for P1083 range from $300 to $900, depending on the vehicle and root cause.
Which vehicles are affected by P1083?
Au7o has documented P1083 across 1 vehicle models from 1 manufacturers: BMW.
Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.