Visit to dealership with JB4 on car

[Shoukin Kubi]

Went to dealer for brake wear sensor issues. I left the jb4 installed and set it to map 0 (bypass) dealer ran diagnosis on car, brake sensor was the only problem found. Told SA car idles rough sometimes when cold asked if diagnostic said anything about that. He went to the back came out a few moments later and said nothing came up but the wear sensors.

Do Not buy the break wear sensors for 135 from bimmerworld! They fit properly but the cars brain would not recognize the part as being installed.

[Lloyd]

the subject line threw off the moral of your story.

other than that, good to know

[EuroB6]

I really dont think it's much of an issue, because they werent "looking" for anything. Im sure, even with a bypass, or even if you take the hardware out, can't they view logs, such as boost pressure and figure out that you are pushing a higher PSI than normal? Wouldnt that be a flag. As well as other readings, from being tuned. Any input?

[Satalite]

Originally Posted by EuroB6

I really dont think it's much of an issue, because they werent "looking" for anything. Im sure, even with a bypass, or even if you take the hardware out, can't they view logs, such as boost pressure and figure out that you are pushing a higher PSI than normal? Wouldnt that be a flag. As well as other readings, from being tuned. Any input?

IF they wanted to look hard enough I would assume it is possible as your car records all that information...

[baylor1er]

The JB4 has an auto-delete function for the "hidden tuner code" that tells the dealer if you have been running high amounts of boost. The only thing I have heard about is if you get the speed delimiter and take the car above the factory top speed (I believe 130mph non-sport, 155mph sport package) they can read that and will void the warrenty.

[EuroB6]

Good to know. thanks

[FJUNO78]

Originally Posted by EuroB6

Good to know. thanks

Who's to say they didn't flag your car? Obviously brake issues are not related to a tune, but let's say your turbos have an issue in a month, that can be a different story.

Unlikely, yes. But I still think it was a stupid move to leave it in.

[FJUNO78]

Originally Posted by FJUNO78

Who's to say they didn't flag your car? Obviously brake issues are not related to a tune, but let's say your turbos have an issue in a month, that can be a different story.

Unlikely, yes. But I still think it was a stupid move to leave it in.

Woops, thought you were the OP. My bad.

[Ash83]

Do not be a smart ass and leave the JB4.. if it worked for you once keep it to yourself... if they flag your care YOU WILL SCREWD for any future warranty work. a friend of mine had to pay over 5K in repair for turbo because his used car (335i) was flashed and he did not know when he bought it. he is sueing the old owner now, the case is till in court but to be honest i do not see him getting anything out of it.

[135iiiiii]

Originally Posted by FJUNO78

Who's to say they didn't flag your car? Obviously brake issues are not related to a tune, but let's say your turbos have an issue in a month, that can be a different story.

Unlikely, yes. But I still think it was a stupid move to leave it in.

Agreed, most techs are familiar with the JB4. All they have to do is push your steering wheel buttons to know its installed even if you had it set to map 0/bypass. I will pull mine out (30 min worth of work) everytime before taking it in.

[Top Gon]

Originally Posted by 135iiiiii

Agreed, most techs are familiar with the JB4. All they have to do is push your steering wheel buttons to know its installed even if you had it set to map 0/bypass. I will pull mine out (30 min worth of work) everytime before taking it in.

I wonder if just unplugging the JB4 from the power and leaving it in would suffice. I don't think techs will need to open the ecu box for anything.

[135iiiiii]

Originally Posted by Basheezy

I wonder if just unplugging the JB4 from the power and leaving it in would suffice. I don't think techs will need to open the ecu box for anything.

That would probably work but if you're already in the ecu box to disable the power you might as well just pull it out to be on the safe side. It would be just another 5 minutes. With the price of a transmission or the turbos I'm not leaving anything to chance.