Manifold-pressure sensor

In the intake manifold or charge-air tract, depending on design.

Its electrical signal represents pressure; temperature sensing may share the same housing.

A pressure gauge reporting to the engine’s computer.

Implausible boost or load readings can arise from the sensor, connector or an actual air leak.

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.

BMW combustion models; boost hardware applies to turbocharged engines only.