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Home >> BMW >> 2011 >> 323i Standard >> Repair and Diagnosis >> Accessories & Equipment >> Gauges & Instrument Panels >> Engine Electrical System - Repair - E90 (N52) >> 1214 Electronic Switching Or Contr.Units >> 12 14 600 Removing/replacing knock sensors (N52, N52K, N51) >> Necessary preliminary tasks

Necessary preliminary tasks

Unlock plug (1) and remove.

Fig 1: Identifying Plug
G04751293Courtesy of BMW OF NORTH AMERICA, INC.

Release screws on both knock sensors (1) and remove knock sensors (1).

Installation: 

Replace aluminium screws. 

Tightening torque 12 14 1AZ .

Fig 2: Locating Knock Sensors
G04751294Courtesy of BMW OF NORTH AMERICA, INC.

Installation: 

Clean support face of knock sensors on engine block.

Fig 3: Locating Contact Surface Of Knock Sensors On Engine Block
G04748562Courtesy of BMW OF NORTH AMERICA, INC.
NOTE: Check stored fault messages.

Delete fault memory.