[Crispykickz]

I have a '15 435i that has sporadically given me DME 118602/P2096 - Oxygen sensor before catalytic convertor fine mixture control, exhaust gas after converter too lean.

I understand this could be attributable to several things...more air in the system or a bad O2 sensor.

Here's the thing - it only comes on when I have JB4 Map 1 turned on. Additionally, it takes a really really really long time for it to come on, like months after switching to the map. It takes so long that I forget about it until one day it pops up.

The first time this happened, I cleared the code and switched to JB4 Map 0...the code never came back in over a year. Then I installed the MPE and was playing around with the exhaust flap settings and decided to turn Map 1 on again. That was several months ago...and then the code came back yesterday.

Would there be something in the Map 1 tune that could be causing this condition? If I came back within a few months with the Map 1 off - I'd consider starting to poke around to check for any air leaks..but its just fine with Map 1 off, so its got me confused.

I have a chargepipe and upgraded intercooler - but other than everything is stock.

Car drives fine with or without the CEL on.

Thanks!

[n55david]

Originally Posted by Crispykickz

I have a '15 435i that has sporadically given me DME 118602/P2096 - Oxygen sensor before catalytic convertor fine mixture control, exhaust gas after converter too lean.

I understand this could be attributable to several things...more air in the system or a bad O2 sensor.

Here's the thing - it only comes on when I have JB4 Map 1 turned on. Additionally, it takes a really really really long time for it to come on, like months after switching to the map. It takes so long that I forget about it until one day it pops up.

The first time this happened, I cleared the code and switched to JB4 Map 0...the code never came back in over a year. Then I installed the MPE and was playing around with the exhaust flap settings and decided to turn Map 1 on again. That was several months ago...and then the code came back yesterday.

Would there be something in the Map 1 tune that could be causing this condition? If I came back within a few months with the Map 1 off - I'd consider starting to poke around to check for any air leaks..but its just fine with Map 1 off, so its got me confused.

I have a chargepipe and upgraded intercooler - but other than everything is stock.

Car drives fine with or without the CEL on.

Thanks!

yes it could. if it happens while using the map and then doesn't when you're not.. well, I mean

contact burgertuning and they will help you out.

[Crispykickz]

Thanks ... this actually came back this time with all maps off. Will be taking to a shop next week for evaluation.