CEL after header install *help*
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From: Queens, NY
04 w211 E55
CEL after header install *help*
I just had EC mid length headers installed and even after the flash I am still throwing a CEL. P0141/P0161 are the codes. I noticed when I popped open the hood that the O2 sensor on the header is in. The second O2 sensor is not in there. They are in the box with the stock headers.
Should those second O2 seniors be in there also or is normal to not put them back in? Any information is appreciated.
Should those second O2 seniors be in there also or is normal to not put them back in? Any information is appreciated.
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E55
they will not cause damage to the engine but the ec tune needs them to be installed for the check engine light to stay off. or you can have the monitor disabled with a star. they are only used for emissions to monitor the efficiency of the primary cats.
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Sold - 05' E55
Agreed, go with the 90 degree extenders.
Keep in mind, you'll have to take care of the readiness prior to an inspection. This can be done through das.
Keep in mind, you'll have to take care of the readiness prior to an inspection. This can be done through das.
Last edited by kompressede; Jul 10, 2015 at 08:51 AM. Reason: edit
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Joined: Apr 2014
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From: Richmond, VA
E55 W211, G55 W463, 2010 GT500, 2008 S4 Cab (Wife), LR4
OP, how do you like your new headers?
Both upstream & downstream o2's are still installed on my car. I went to Eurocharged Toronto and got my car dyno'd. During that time, they turned mine off. I havent had any issues since.
I'm just curious what I need to do when inspection is due.
Both upstream & downstream o2's are still installed on my car. I went to Eurocharged Toronto and got my car dyno'd. During that time, they turned mine off. I havent had any issues since.
I'm just curious what I need to do when inspection is due.
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2003 W211 E55, 2003 W220 S600
Thread Starter
MBWorld Fanatic!
Joined: Apr 2008
Posts: 1,762
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From: Queens, NY
04 w211 E55
OP, how do you like your new headers?
Both upstream & downstream o2's are still installed on my car. I went to Eurocharged Toronto and got my car dyno'd. During that time, they turned mine off. I havent had any issues since.
I'm just curious what I need to do when inspection is due.
Both upstream & downstream o2's are still installed on my car. I went to Eurocharged Toronto and got my car dyno'd. During that time, they turned mine off. I havent had any issues since.
I'm just curious what I need to do when inspection is due.
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From: Tampa Bay, FL
05 E55, 98 CLK320
All 4 sensors should be in place, then reset your ECU to reset fuel trims, and then install a tune to get the most out of them.
No need to code out the rears, only if you remove cats/
No need to code out the rears, only if you remove cats/
Member
Joined: Jan 2016
Posts: 88
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From: Chandler, AZ
2004 E55
I just had EC mid length headers installed and even after the flash I am still throwing a CEL. P0141/P0161 are the codes. I noticed when I popped open the hood that the O2 sensor on the header is in. The second O2 sensor is not in there. They are in the box with the stock headers.
Should those second O2 seniors be in there also or is normal to not put them back in? Any information is appreciated.
Should those second O2 seniors be in there also or is normal to not put them back in? Any information is appreciated.
If the tuner turns off via his tune, you will fail emissions and it will show not ready. It is best to disable via star in the ECU. This method will allow the rear 02's to be "ready" and will show that during emissions and not raise any flags.
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