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      12-01-2012, 12:26 PM   #1
Brigadier General

Drives: Three Hundred and Thirty Five
Join Date: Jul 2010
Location: Yonkers NY

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2007 BMW  [3.50]
How to tell if JB4 is For N54 Or N55

I emailed terry this

Hey terry i recently acquired a jb4, but the previous owner has used it on his N54 335i, but he informed me that when he went to update the jb4 (G4) the window screen said it was n55. a warning message came up saying are you sure you want to update with n54 update on a n55 engine? Is there anyway i can tell if this control box is for n54 or n55?

as always he one word answered me back with N54.

Im not 100% sure if its for n54 or n55. anyway i can tell?