Seller notes

Genuine BMW replacement HFM for N20 turbo 4-cylinder (228i/328i/428i/528i X3/X4), S55 twin-turbo 6-cylinder (M2/M3/M4), and S63TU twin-turbo V8 (M5/M6/X5M/X6M) Open box item in like new condition, may be missing original packaging - see photos and feedback. 20% restocking fee on all returns The airflow sensor or HFM (Hot Film Meter) is hugely important in the performance and fuel economy of the engine. Faulty airflow sensors usually cause rough running, poor idle, lack of performance, misfires, ...

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