E55amg0220

So for some reason im getting these to codes even though the car is running amazing and there are no air leaks or exhaust leaks, new sensors an new cats im so confused

drothgeb

I have the same thing now after my header install and an EC tune. EC told me to call them and said that along with my car running very rich must be a.problem some where else and not the tune.

E55amg0220

thatd exactly what EC is telling me too idk why i cant find any leaks anywhere .... i was told to use star an turn off the rears properly but i dont hve one round here that i know of nor the money at the moment to buy one.

drothgeb

Did you ever get this resolved? I currently have the same issue with headers and an EC tune.... But my rear O2s are just zip tied up, and my car running pig rich. Jerry said they are "commanding" 11.7 and it must be a hardware issue.

EDIT: This comment was meant for a different thread
Auto thread scroll feature strikes again.

https://mbworld.org/forums/w211-amg/682217-p2096-p2098-persist-after-installing-mid-length-headers.html#post7359362

E55amg0220

well depending on where u live i found out from a company near me that if i just turned em off that i would still fail emissions. Jerry suspected an airleak but since everything is welded and both banks are saying it and the only thing i did was remove stock headers an midpipe an install mbh an midpipe it shoulda been doin before hand if i had some big airleak. Makes an models told me they believe its now getting alot more flow which is wiggin the rear sensor cause my afr is 14.2 to 14.9 cruise .... idle is perdect 14.4 to 14.8 an wot throttle is 11.4 so its pretty on the money. But they suggested to try some rear 02 extenders they use so i did .... fingers an toes crossed .... cant hurt to try

drothgeb

No emissions for me

But I still would like to not get these rear O2 codes. I payed 35$ for a return for headers and asked for the rears to be disabled. He didn't tell me he can't he, just sent me a new tune. It seems that if they were disabled I wouldn't get a code for the rears being too lean and I don't see how getting a code on disabled O2 sensors would be related to an install issue.

Just kind of makes me wish I had gone with a tune from Anthony. All good though hopefully some one can figure it out haha.

E55amg0220

i have tunes from tony an jerry they both disabled the rears an both tunes these codes came up they cant be coded out you have to use a star an turn them off. If u have no emissions send in computer to jerry an 50 bucks he can star code them off for u .... solved. Wish it were that easy for me .... i hate emissions. But i cant find any leaks at the header flanges they are tight an all gaskets are there an i used new ones. Being their MBH dont see them being warped either and besides both sides are giving me the code an even if one was warped dont think both would be. An i even did the lil incense test near the flanges an nothing .... an mine is quiet no tell tale tick exhaust leak sound its as quiet as it was with stock system just slightly deeper.

drothgeb

That's a bummer. I don't know why he wouldn't tell me about the O2 codes though. We've had multiple emails with me asking about them and he hasn't said that to me at all. Anyways I can get over the codes as long as I can fix my AFR. I'm running pig rich 10.1-10.3 range. Guess. I'll give them a shout and see if we can get it figured out.

E55amg0220

Ok update i went out disconnected the battery for 2 hrs let the ecu relearn fhe ltft and the stft ..... and drove it for 40 miles and it seems to be doing better i havent gotten the p2098 or p2096 codes yet but nooooooow im getting the cat efficency below threshold on bank 1 and 2 HUH?????? WTF .... i have 400 cell obd2 high flow cats on this makes no sense i didnt get those codes before ugggh!!!! Im really hating getting headers already haha. So would love to hear some thoughts .... solutions ..... help needed

PieRat

I have kleemann's I removed the rear cat's and replaced with x pipe using EC canned tune. I believe as soon as you mod the exhaust they typically code out the rear cat's using the tune so seems odd you'd have problems.

What are you LTFT percentages showing now you reset?
Did you have to extend your primary o2 sensors?
When you flash, do you use euroflash or mygenius and do you have any packets fail?

E55amg0220

didnt have to extend the primarys at all just the rears an i made sure they were soldered an secure. I use my laptop to flash the tune in an havent had a packet fail yet.

my ltft were round 4.7 or so then did a hard reset an they went too 2.3 an 1.6 and like i said i havent seen the p2098 n 96 yet just now i have gotten the cat below threshold but im gunna try some o2 non foulers an see if that takes care of it.

hayseed

iTrader: (2)

keep us informed please -- this seems to be common place with headers -- I have a set in a box sitting in the garage and this makes me not want to install them despite the benefits

E55amg0220

the benefits are.amazing just seems like theres small nuisances that have to addressed. Im gunna go buy some non foulers this morning an hopefully tht will take care of the new codes .... 🤞

MACEDON

reset your ECU tbh, reset fuel trims

unplug battery for 30 minutes (the one in the trunk)

that's what solved my issue anyway

I drove myself insane trying different gaskets and what not...

To the person wondering about the headers definitely get them installed they're a game changer.

MACEDON

Just saw this... yeah now you just gotta get coded for no cats basically, for this get in touch with jerry.

I have no cats whatsoever and had that CEL. For applications like this it might be best to just do a custom tune tbh

E55amg0220

i would but i cant code them out cus i have emissions here gunna try 02 non foulers again an see if that will keep the cat efficency below threshold codes from coming on. Wish me luck i have a tune that i can load up that has the cats coded out but for emissions i cant pass if i do. So hoping the foulers will take care of it.

drothgeb

I have been requesting the rears be disabled from the get go and I still get the codes so I don't actually think EC can anyway. Good luck with the foulers though hopefully that works out.

jmb614

If the rear O2 sensors do not detect enough of a difference between front to rear it will throw those codes. The extenders should help. Also, the ECU is very sensitive to O2 sensor wiring/resistance/etc., we needed to solder the extended O2 sensors wiring versus simply crimping.

If you want to pass emissions with those codes you will need a STAR with DEV mode enabled, to disable monitoring of the rear O2 sensors. If you are in NV hit me up.

E55amg0220

well the foulers dont fit so for now installed my tune with the rears disabled an no codes but like this i know it wont pass emissions so gunna look into what the guy above can do to help me out. If nothing then i may be able to just register it to my cousins in box elder county they dont require emissions. But would rather just being able to pass in my county.

hayseed

iTrader: (2)

I was going to use these based on some searches on this forum -- not sure if they are still around as the thread was a few years old
http://bigdaddiesgarage.com/mini-cat-cel-fix.html

MACEDON

What a pain in the ***... that's why I love Florida it's like the wild west here. We do whatever we want

E55amg0220

yeah my dad still lives there in port st lucie i miss florida

E55amg0220

those look promising havent tried em

but i uploaded my tune with the rears turned off an no more codes after 60 miles of hard driving so far. But i have a few options i can get a po box in my cousins county which doesnt require emissions. I have a buddy that does emissions that may be able to help me, or if the guy above in NV can wk some magic on my computer through star then ill just do that. But its running great so far