To guarantee reliability, choose BMW part # 12147830788 Engine Knock / Ping / Detonation Sensor. It is also referred to as Knock Sensor. This genuine part is built directly by BMW under very rigorous testing and developed using reliable materials to tolerate years of heavy use and present long-lasting performance. This part fits 2001-2006 M3, 2001-2002 Z3 M, 2006-2008 Z4 M.
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