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Home >> BMW >> 2011 >> 335i 2D Convertible, Automatic >> Repair and Diagnosis >> Engine Performance >> Ignition System >> Engine Electrical System - Repair - E90 >> Control Unit Box >> 12 90... Removing and installing/replacing electronics box >> Replacement
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12 90... Removing and installing/replacing electronics box: Replacement

Modify water drain valve (2) and bump stop (3).

Fig 1: Identifying Water Drain Valve And Bump Stop
G04751305Courtesy of BMW OF NORTH AMERICA, INC.

Installation note: 

Make sure seal (1) is correctly seated on electronics box.

Fig 2: Identifying Seal On Electronics Box
G04740388Courtesy of BMW OF NORTH AMERICA, INC.