update When I clear the code with MHD it goes away, if I go to start the car it starts up then begins to stutter and comes back but if I clear it, it stays gone until I go to start the car later.

So I installed downpipes on my 335is yesterday and I got a code after starting it up this morning. No code on the drive home but once I started it this morning I got;

“2C3E - DME: Oxygen sensor 2 before catalytic converter: Line fault. 2CAB - DME: Oxygen sensor 2 before catalytic converter: Temperature.”

I did flash it with MHD stage two with aftermarket downpipes, I’d appreciate help on this since I can’t seem to find much. I know the 02 sensors have less then 3k miles on them.

Thanks I’m advance