Bracket knock sensor — a genuine BMW part, number 11 61 7 503 521. The number stamped on the part is 11617503521; BMW's catalog files it under the short number 7503521. You will find it on our Engine shelf, under Intake manifold system.
It fits every E46 body style (316i, 316ti, 318i and 318ti, 2001–2004), with the N40, N42, N45 or N46 engines.
BMW draws it on 4 diagrams, among them Intake manifold system (11_3194) and Mounting Parts F Intake Manifold System (11_3387). It weighs about 10 g (under 0.1 lb).
We have not had one on the shelf yet. Request it and we will tell you when one comes off a car.
