[bonwit904]

I have a 2009 335xi and for the past 4 months have had a JB+ installed on it with no problems at all - no codes, no warnings, lights, etc... I have it set at default (50%).

Yesterday I started it up and immediately a engine malfunction warning came on (reduced power, etc..) in the iDrive, with the yellow half-engine warning light in the dash as well. I immediately turned off the car, and restarted it (letting it sit for about 2 seconds in between) the light turned off and everything returned to normal. The car did not sound, or feel any different when the warning was on (granted I was only in my driveway). After driving it once I restarted the car everything felt normal - there was definitely no power loss at all.

Do you think this could be caused by the JB+ and am I throwing a code?

I am going to bring it into the dealer for service in 2 weeks anyhow.

Does anyone have a BT scanner they would be willing to scan my car with? I will provide a cash payment as you see fit..(given that you purchased the scanner)..for this favor, before I bring it in. I can come to you...

Thanks for the help

Originally Posted by bonwit904

I have a 2009 335xi and for the past 4 months have had a JB+ installed on it with no problems at all - no codes, no warnings, lights, etc... I have it set at default (50%).

Yesterday I started it up and immediately a engine malfunction warning came on (reduced power, etc..) in the iDrive, with the yellow half-engine warning light in the dash as well. I immediately turned off the car, and restarted it (letting it sit for about 2 seconds in between) the light turned off and everything returned to normal. The car did not sound, or feel any different when the warning was on (granted I was only in my driveway). After driving it once I restarted the car everything felt normal - there was definitely no power loss at all.

Do you think this could be caused by the JB+ and am I throwing a code?

I am going to bring it into the dealer for service in 2 weeks anyhow.

Does anyone have a BT scanner they would be willing to scan my car with? I will provide a cash payment as you see fit..(given that you purchased the scanner)..for this favor, before I bring it in. I can come to you...

Thanks for the help

we are in long island, but if you need us, we can help you!

[Crisp]

Originally Posted by bonwit904

I have a 2009 335xi and for the past 4 months have had a JB+ installed on it with no problems at all - no codes, no warnings, lights, etc... I have it set at default (50%).

Yesterday I started it up and immediately a engine malfunction warning came on (reduced power, etc..) in the iDrive, with the yellow half-engine warning light in the dash as well. I immediately turned off the car, and restarted it (letting it sit for about 2 seconds in between) the light turned off and everything returned to normal. The car did not sound, or feel any different when the warning was on (granted I was only in my driveway). After driving it once I restarted the car everything felt normal - there was definitely no power loss at all.

Do you think this could be caused by the JB+ and am I throwing a code?

I am going to bring it into the dealer for service in 2 weeks anyhow.

Does anyone have a BT scanner they would be willing to scan my car with? I will provide a cash payment as you see fit..(given that you purchased the scanner)..for this favor, before I bring it in. I can come to you...

Thanks for the help

You need a scan.
It could be your HPFP going.


Either way, it's too risky to go into the dealer without a scan if you have/had a tune installed.
Get a scan first, then go to the dealer.
The scan might also save you the trip of going to the dealer if the JB+ triggered the code.

[Alex@AKMotorwerk]

Originally Posted by bonwit904

I have a 2009 335xi and for the past 4 months have had a JB+ installed on it with no problems at all - no codes, no warnings, lights, etc... I have it set at default (50%).

Yesterday I started it up and immediately a engine malfunction warning came on (reduced power, etc..) in the iDrive, with the yellow half-engine warning light in the dash as well. I immediately turned off the car, and restarted it (letting it sit for about 2 seconds in between) the light turned off and everything returned to normal. The car did not sound, or feel any different when the warning was on (granted I was only in my driveway). After driving it once I restarted the car everything felt normal - there was definitely no power loss at all.

Do you think this could be caused by the JB+ and am I throwing a code?

I am going to bring it into the dealer for service in 2 weeks anyhow.

Does anyone have a BT scanner they would be willing to scan my car with? I will provide a cash payment as you see fit..(given that you purchased the scanner)..for this favor, before I bring it in. I can come to you...

Thanks for the help

Shoot me a PM or email if you need a code scan. We can provide this at our shop and we're in NJ.

[bonwit904]

Any forum members in the Northern NJ area?

[ash-bimmer]

i have the same issue with my JB+ on 2007 BMW 335i. The check engine light goes off automatically on restarting the car again. There were no error codes that were being on after installing the JB+ and the car ran fine for like 7 months with the JB+.
I have now removed the JB+ and taking the car to BMW dealership for a check. May be its the FP but the FP has been replaced 2 times under warranty now so am not sure.

How did you fix yours?

[TiAg335i]

Had the same exact problem with my JB+...sold it a long time ago and never cared to troubleshoot it

[kfrazie1]

That's odd. I've had my jb+ in for a few months and never had a problem. I have it set lower than default though, about 35%.

[gustnyc]

i had mine one set at default for 3 months and just recently took it off last weekend to bring in the car for service.. i just put it back on yesterday and cranked it to 75%. I'll keep u updated or will let u know if something acts ups. I had that check engine light come up before and then it goes away..i brought the car in for service and it was the fuel pump..i think the jb+ is not a strong enough tune to throw of codes..imo