Air & turbo
Air-mass sensor
Measures incoming air mass for engine management.
In an intake duct on systems that use a dedicated air-mass meter.
Its measured signal helps the controller determine fueling and check airflow plausibility.
A counter at the intake entrance.
Incorrect readings can affect running, but unmetered-air leaks and wiring can mimic sensor failure.
Filters follow the vehicle service schedule; ducts and boost hardware are inspected for condition, sealing and operation.
A hose or filter is generally simpler to service than a turbo assembly. Access and diagnosis can dominate cost.
Not every BMW engine uses the same airflow-measurement strategy or sensor arrangement.
BMW combustion models; boost hardware applies to turbocharged engines only.
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