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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N55 Turbo Engine Tuning and Exhaust Modifications - 335i Tuning > JB4 question..BMW computer cannot communicate?



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      09-29-2012, 09:26 AM   #1
driftbrick744
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Question JB4 question..BMW computer cannot communicate?

After installing the JB4 on my 07 335xi, it seems as if the BMW diagnostic computer cannot communicate with the car. Do I need to change the map that the JB4 is on to allow BMW to communicate with my vehicle? I am starting to hear the dreaded wastegate rattle, and the car is still under warranty..just want to be sure BMW can communicate with the vehicle before I bring it in. Thanks!
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      09-29-2012, 09:30 AM   #2
mrj25
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This should be in the n54 section. The answer to your question is to remove the jb4 just to be safe.
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      09-29-2012, 10:54 AM   #3
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Quote:
Originally Posted by mrj25 View Post
This should be in the n54 section. The answer to your question is to remove the jb4 just to be safe.
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To communicate -> Map 0

To be sure your BMW service doesn't deny warrenty -> uninstall!!! (Clear codes before and praise they don't find shadow codes...)
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