help! 2c7e code after new exhaust install

sabredog · 10-11-2009, 04:19 PM

I installed a new exhaust yesterday with no secondary cats.car ran fine yesterday.started car today felt slight misfiring for about 30 seconds and then it cleared up.drove the car home from the store and service engine soon light came on steady.i checked the codes with bt scanner. found 2aaf and 2c7e codes.wtf !car only has dci and jb3. new addition rennart exhaut.any ideas? thanks

sabredog · 10-11-2009, 04:48 PM

anybody have this happen? there aren't any other emission sensors after the secondary cats , so why would a code come up?

scottp999 · 10-11-2009, 05:08 PM

Happened to me twice after a downpipe back exhaust was installed. Never happened again after. I think the computer gets suprised by the better flow in the first couple times you get on it. I would clear the codes, and they shouldn't come back unless it is something more serious.

sabredog · 10-11-2009, 06:51 PM

i'll see if that happens.the misfire was strange though, never happened before,but also didn't set a code, p0300 for misfire.idk?2aaf though ,i shouldn't worry about i guess ?

scottp999 · 10-11-2009, 08:07 PM

Take the car out tomorrow and see if you can get it to do it again. It happened twice to me on the ride home from the exhaust shop. First time I tried to get on the highway about 1 mile from the shop. I got it to do it again on that same trip by going WOT on a side road. I went in the house, eat some lunch, called the shop because I thought something was wrong. Got in the car after lunch and I could never get it to happen again. That was probably almost 2 years ago.

sabredog · 10-11-2009, 08:52 PM

thanks, i'll try that. it's nice to have a scan tool.

sabredog · 10-16-2009, 10:25 AM

well after the code came back on again for the 4th time, i decided to go back to the stock exhaust. problem solved! i want to see if anyone else had this problem and why it occured.there are plenty of downpipe back exhausts out there and i can't believe i'm the only one with this issue.

HPFREAK · 10-16-2009, 11:10 AM

Quote:

Originally Posted by gofast!

Sorry if I'm hijacking the thread, but I've started to notice something funny with my month old catless AE system.

Whenever I drive off after starting the car, I hear a very subtle popping sound in my mufflers (almost like something is tumbling around in my trunk). It's only a few very small and barely audible pops that last for a second or two and then go away. This typically only happens in the morning when I start the cold engine after sitting overnight.

Is this a mis-fire or something else I should worry about? Is it related to the codes you're seeing? I'm completely stock aside from this exhaust and some coilovers.

You know I have heard the same type of noise with my car but with stock exhaust. I have thrown a misfire code a couple days ago, and it may be the reason. Could have to do with the plugs or injectors I was told. The 2AAF is something a lot people have pop up with a tune.

thwgw24 · 10-16-2009, 11:13 AM

Quote:

Originally Posted by sabredog

well after the code came back on again for the 4th time, i decided to go back to the stock exhaust. problem solved! i want to see if anyone else had this problem and why it occured.there are plenty of downpipe back exhausts out there and i can't believe i'm the only one with this issue.

you are not the only one. I was getting all these O2 sensor related codes (2C7F,2C6C,2C74,2C6A,29F5,2C73,2C7E,2C27,29F4) after I installed the AE exhaust with my Procede. Switched from Procede to JB3 three days ago and now all these codes are gone. The only one i'm still getting right now is 29E0 (fuel mixture control). Terry suggested me to run map 0 and see if I'm still getting this code.

sabredog · 10-16-2009, 01:43 PM

The first time the code came on was a cold start the morning after I installed the exhaust. My car also misfired for maybe 20 seconds and then cleared up. When the light came on the only code I had was 2c7e.I cleared it and then the next time I drove it , the code came back on. this happened 2 more times and then I decided to reinstall my stock exhaust and I haven't had a problem since. Weird! Looks like I will have to go with just an axle back system.

10-11-2009, 04:19 PM	#1
sabredog Second Lieutenant 21 Rep 222 Posts Drives: 2007 335i 4 dr Join Date: Jun 2008 Location: delaware iTrader: (3)	help! 2c7e code after new exhaust install I installed a new exhaust yesterday with no secondary cats.car ran fine yesterday.started car today felt slight misfiring for about 30 seconds and then it cleared up.drove the car home from the store and service engine soon light came on steady.i checked the codes with bt scanner. found 2aaf and 2c7e codes.wtf !car only has dci and jb3. new addition rennart exhaut.any ideas? thanks
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10-11-2009, 04:48 PM	#2
sabredog Second Lieutenant 21 Rep 222 Posts Drives: 2007 335i 4 dr Join Date: Jun 2008 Location: delaware iTrader: (3)	anybody have this happen? there aren't any other emission sensors after the secondary cats , so why would a code come up?
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10-11-2009, 05:08 PM	#3
scottp999 Brigadier General 133 Rep 4,764 Posts Drives: 4runner SR5 Join Date: Mar 2007 Location: MD iTrader: (2) Garage List 2007 BMW 335 [9.00]	Happened to me twice after a downpipe back exhaust was installed. Never happened again after. I think the computer gets suprised by the better flow in the first couple times you get on it. I would clear the codes, and they shouldn't come back unless it is something more serious.
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10-11-2009, 06:51 PM	#4
sabredog Second Lieutenant 21 Rep 222 Posts Drives: 2007 335i 4 dr Join Date: Jun 2008 Location: delaware iTrader: (3)	i'll see if that happens.the misfire was strange though, never happened before,but also didn't set a code, p0300 for misfire.idk?2aaf though ,i shouldn't worry about i guess ?
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10-11-2009, 08:07 PM	#5
scottp999 Brigadier General 133 Rep 4,764 Posts Drives: 4runner SR5 Join Date: Mar 2007 Location: MD iTrader: (2) Garage List 2007 BMW 335 [9.00]	Take the car out tomorrow and see if you can get it to do it again. It happened twice to me on the ride home from the exhaust shop. First time I tried to get on the highway about 1 mile from the shop. I got it to do it again on that same trip by going WOT on a side road. I went in the house, eat some lunch, called the shop because I thought something was wrong. Got in the car after lunch and I could never get it to happen again. That was probably almost 2 years ago.
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10-11-2009, 08:52 PM	#6
sabredog Second Lieutenant 21 Rep 222 Posts Drives: 2007 335i 4 dr Join Date: Jun 2008 Location: delaware iTrader: (3)	thanks, i'll try that. it's nice to have a scan tool.
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10-16-2009, 10:25 AM	#7
sabredog Second Lieutenant 21 Rep 222 Posts Drives: 2007 335i 4 dr Join Date: Jun 2008 Location: delaware iTrader: (3)	well after the code came back on again for the 4th time, i decided to go back to the stock exhaust. problem solved! i want to see if anyone else had this problem and why it occured.there are plenty of downpipe back exhausts out there and i can't believe i'm the only one with this issue.
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10-16-2009, 01:43 PM	#10
sabredog Second Lieutenant 21 Rep 222 Posts Drives: 2007 335i 4 dr Join Date: Jun 2008 Location: delaware iTrader: (3)	The first time the code came on was a cold start the morning after I installed the exhaust. My car also misfired for maybe 20 seconds and then cleared up. When the light came on the only code I had was 2c7e.I cleared it and then the next time I drove it , the code came back on. this happened 2 more times and then I decided to reinstall my stock exhaust and I haven't had a problem since. Weird! Looks like I will have to go with just an axle back system.
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