Gadget

2006 E55

Eurocharged Stage 3
MBH headers and mid pipe.

Every time I drive the vehicle I get this code.

What I am looking for is information on the ECU strategy/monitor that is used for this code. Basically what the ECU is looking for that causes this code to be set.

I have full access to Toyota/Lexus data and have been able to solve these problems on modified vehicles, but I cannot find the info on Mercedes for this code.

Do any of you have access to the Mercedes FSM and the diagnostic info for this code that can post it or email it to me?

Thanks!!

G

xpl0sive

i think that the code for the rear O2's... you need them turned off

novae500

If its the rear o2s, then buy a set of bung extensions that are L-shaped. I got mine from Bruce TTM and running them with rear cats. Over 3,000 miles with my MBH headers.

Gadget

It is not a code for not having a cats installed, it is something else.

I cannot find any info on the monitor for that code so I have no idea what the monitor is looking for.

When you say turn off the rear O2s, is that for removing the cats or specific to this code. If it is for that code, how are the rear O2s turned off?

G

jmb614

After I installed my MBH headers I was getting this code as well. Per Jerry's advice I replaced the rear O2 sensors, checked for exhaust and vacuum leaks, and installed the 90 extenders. On my car, none of this worked until Jerry re-flashed the car. Monitoring of the rear O2's had been turned off previous to installing the headers, and I did not have any CEL issues until the headers were installed and rear O2 sensors were extended.

I don't believe the extension of the O2 sensors caused the issue, considering that once the car was retuned, everything was fine, and yes I replaced the rear O2's with Bosch Universals and had the silver core leads soldered.

Since then I've had Jeremy tune the car, and no issues either. I believe this may have to do with the ECU's ability to trim LTFT's. Once the tune is changed to compensate for the headers the CEL's went away.

Check out this thread: https://mbworld.org/forums/w211-amg/...2098-code.html

novae500

any chance the rear o2s were swapped? Some guys got this code after adding headers where o2s were put in incorrectly. When i had my mbh installed, i had the extenders as well and ran without any CEL codes. Then got OE to tune the car for headers, pulley and believe he turned the rear o2s off. Since i went to advance auto and got a code reader and said o2 readiness 'not ready' monitor.

"i had this problem after getting long tubes installed and it turned out that the shop installed the upstream and downstream sensors in reverse... once i swapped positions the codes went away and have been gone since." from a response on the thread linked above.

jmb614

That's a possibility as well I would think. Though I don't understand why the code doesn't pop up for both banks, as was the case with my car; P2096 and P2098 were both present.

Peter_02AMG

Its weird that I got 2 P2198 code after installing my LTH but not P2098..I also got P0420 & P0430

novae500

420 and 430 should be solved w/the bung extensions.

adianaty

Gadget - Check my photo album since I uploaded pics of the STAR DAS screens for P2098.

https://mbworld.org/forums/members/a...r-screens.html


Peter - If your code came from an E63, it will be different. The OBD versions are slightly different from the E55.

Gadget

I think it is clearing up a little bit.

If you look at the description in the header for that code,

Aging correction variable exceeded. Delay time too long

What that may be saying is that there is an excessive transient delay from the time the ECU makes a correction to the A/F ratio and the time it is read by the O2 sensor. With the long tube headers moving the O2 sensor further from the engine the transient delay in the response will increase and it maybe to much delayed and the ECU has diagnosed a fault.

If that is the case, it is the long tube headers causing the the problem and not the calibration. The O2 sensor will need to be moved closer to the engine to reduce the transient response time.

Is there a way to alter the acceptable transient time by altering the code in the ECU?

Do other folks with aftermarket ECU calibrations from other tuners have this on going P-2098 problem?

G

jmb614

Thanks for posting that Adianaty! Sounds like that could also be a failing primary O2 sensor? Reason I ask is because a few months after those codes appeared and were cleared, I needed to replace the primary O2's.

It would be interesting to see if moving the sensors closer would help.

adianaty

I don't think it's the length per se. It's more likely to be a leak. The difference in location is maybe 12" and I would think the gases would travel that far after one compression cycle which would be as fast as the ECU could change AFR effectively.

Also I have brand new O2's and still got the code.

jmb614

P2198, is that a too rich code, or something completely different as Adianaty STAR screenshots of the P2098 code show a correction/aging issue, originally thought to be a too lean code.

Are you running MBH LTH's as well?

Peter_02AMG

I'm running TTM/ARH LTH with cats

I can smell unburn fuel at start up.

sunnybenz45

Where you able to figure it out? I'm getting a P2098 obd code, ECM codes are P207F-000 & P2081-000. Started getting these after installing HF cats on my LTH. Before the cats all was good.