[driftbrick744]

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!

[E90Company]

You need to put it in map 0.

[Pete Schweaty]

Originally Posted by E90Company

You need to put it in map 0.

+1. Put it on map 0.

[driftbrick744]

If they DO replace the turbos, chances are they will reset the ECU though..won't the JB4 come in the way here?

[bigdaddycane]

if you're bringing it in (or brought it in) take the JB4 out! Unless one of the techs or Service manager is a family member I would not leave the JB4 attached.

[Randomaccess335]

Mine needed to be taken out and you should just in case of dealer issues

[JamesM3M5]

Map 0 should be fine for plugging in a diagnostic computer. My Autologic cannot read a JB4 car unless it is in Map 0 with the engine running or not. With a Procede, I can read it in any map as long as the engine is not running. Once it is running, it has to be in Map 0.

[driftbrick744]

Thanks for the advice, guys. I have heard the rattle occasionally when letting off the accelerator. After watching videos of the wastegate rattle, it sounds like it. The car has 78K miles on it, so I am hoping to bring it in and have it warrantied before the mileage runs out!