Code 2c40, stock boost

Str8sixTT · 08-25-2013, 06:18 PM

Good afternoon, need a little help please. Recently did a valve cover gasket, after install I get a ses on start up. Car idle a little bumpy on a cold start, surges during wot, and most of the time will only make stock boost level. Code is 2c40 dme, internal error, lambda probe 2, evaluation component. I see the afr is 20 at all times during the log. Do I have a bad sensor of some sort?

Mod list
Jb4 g5 iso
Fmic
Dps

rkv3434 · 01-07-2014, 07:58 AM

Did you ever find out why you had the 2C40 error code after you swapped out you valve cover gasket? I just did the same thing and have the same error. Tried clearing the code but it comes back every time I start the car.

Str8sixTT · 01-08-2014, 04:58 PM

Quote:

Originally Posted by rkv3434

Did you ever find out why you had the 2C40 error code after you swapped out you valve cover gasket? I just did the same thing and have the same error. Tried clearing the code but it comes back every time I start the car.

Yes, on top of the valve cover are two connections for the front o2 sensors, the one closet to the firewall was bad causing the code. After changing the sensor never seen the issue again

08-25-2013, 06:18 PM	#1
Str8sixTT Private First Class 13 Rep 142 Posts Drives: 2007 BMW 335i Sedan Alpine WHT Join Date: Mar 2013 Location: Tampa, FL iTrader: (4)	Code 2c40, stock boost Good afternoon, need a little help please. Recently did a valve cover gasket, after install I get a ses on start up. Car idle a little bumpy on a cold start, surges during wot, and most of the time will only make stock boost level. Code is 2c40 dme, internal error, lambda probe 2, evaluation component. I see the afr is 20 at all times during the log. Do I have a bad sensor of some sort? Mod list Jb4 g5 iso Fmic Dps __________________ \| 07 E90 Alp Wht \| M Sport Bumpers \| JB4 G5 ISO \| \| VRSF 7" FMIC \| AD CP w/ TIAL\| Velos S1 \| Coded \| \| BC Coils \| Proven Power Top mount ST kit \|
	Appreciate 0 Tweet Quote

01-07-2014, 07:58 AM	#2
rkv3434 New Member 1 Rep 21 Posts Drives: 2007 335i Join Date: Feb 2012 Location: Huntsville, AL iTrader: (1)	Did you ever find out why you had the 2C40 error code after you swapped out you valve cover gasket? I just did the same thing and have the same error. Tried clearing the code but it comes back every time I start the car.
	Appreciate 0 Quote