CoolBDPhenom03

Yeah, I'm on H&R coilovers too.

You should see biglee73's photos. He has barely enough clearance with stock suspension to get in and out of his driveway.

CoolBDPhenom03

Spoke too soon, CEL just came back. FML.

khmergod

CoolBDPhenom03

P2198 - O2 sensor signal stuck rich. My SA says the adaptations probably need some tweaking due to the vacuum leak throwing them off. Back to the dealer on Monday.

CoolBDPhenom03

Apparently the issue itself clears on it's own, but I still need to clear the CEL. I guess I'll see if it comes back tomorrow.

biglee73

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CoolBDPhenom03

LOL. CEL is cleared. Supposedly, everything should be okay, but we'll see in about 50 miles.

jvanbrecht

You could probably have fixed that one yourself..

CoolBDPhenom03

Perhaps, but there's always a diagnostic fee. And I needed a smoke test to pinpoint the leak. I'm not savvy enough nor do I have the equipment for a smoke test.

CoolBDPhenom03

Ugh, finally drove enough today, CEL came back. Off to the dealership in the morning...

CoolBDPhenom03

Code P2198 cleared. MB tech reset the O2 parameters since they were all out of sorts due to the "huge" vacuum leak.

CoolBDPhenom03

And it's back...dammit.

503C43 ////AMG

In the OP you mentioned reflashing, was this reflashing the tune or back to stock?

CoolBDPhenom03

Reflashing from one tune file to a different tune. My SA at the dealership thinks it's just the O2 sensor now.

503C43 ////AMG

If the o2 sensor doesn't pan out you might want to try flashing back to the stock tune. This would help eliminate a variable.

CoolBDPhenom03

Yeah, that was my first thought.

CoolBDPhenom03

Okay...I'm leaving my car with MB all day tomorrow. They're going to check my O2 sensor again and examine my exhaust for any cracks/leaks (that's unlikely, but they're trying to rule out all possibilities). The SA knows about my modified exhaust and some of the other Service Managers go out on local drives with some of my friends (guys with Ferraris, R8s, Lambos, etc.), I think one of them even does some of the same Oakland racing as some other folks on the forum, but they're all cool with my vehicle. Not once have they given me any flack. They're also hooking me up with a loaner so fingers crossed. David, my normal SA, won't be in tomorrow, but Jordan (resident AMG master tech) has worked with me before. He's a super cool guy. I don't think I have to tell you guys how eager I'll be to put this behind me and finally get my follow-up dyno run.

Fingers crossed.

CoolBDPhenom03

Car is at MB again. One of the SA's said he just did the manifold gaskets on his '08 C63.

CoolBDPhenom03

Looks like the O2 sensor is fine. What's not fine is a crack in the driver's side LTH at the collector. Pics coming from the SA and I'm shooting the over to Rob@Vivid to take a look. This should be real fun.

SoFlaC63

So wait there's actually a crack in the header? Is the crack in the runner itself was at the plate? Maybe a cracked at a weld.

CoolBDPhenom03

I received some blurry pics from the SA, but Rob could see it. Maybe I'm blind. I'll try to take better pics when I visit the exhaust shop after my car is back together.

CoolBDPhenom03

Latest update for those who are still subscribed:

I turns out the "leak" may actually just be a seal issue between the headers collector and the straight-pipe exhaust. It looks like my exhaust tips on the driver's side extend further out and one of the braces that holes the two tips together is bent, most likely due to some impact that may have pulled the collector off of the headers a bit, enough to break the friction seal.

An exhaust/muffler shop is looking at it right now and thinks it can just be adjusted. Fingers still crossed. Not sure how this would have happened because I couldn't see any obvious sign of impact, but with a lowered car, it could have occurred anywhere at anytime.

CoolBDPhenom03

Update with pics...

Everything at the exhaust shop was tightened up and refitted properly, CEL cleared, and fog light fixed. I am mostly relieved it didn't end up being a crack in the headers collector and that I didn't have to drop the whole system. Fingers are still crossed for the next 50 miles or so to make sure it's really gone...then I can reschedule my dyno

Thanks, everyone, for putting up with my drama.

Mort

Hope this fix to your header connection does it for you and sure looks like it might. This was a long drawn out process to diagnose an exhaust leak. I think you kept your cool but I'll bet your happy it may be over. Rooting for you.

CoolBDPhenom03

Thanks, Mort. It was a pretty grueling week.