mcwattsbenz

Hello,'

My 2011 ML350 BlueTec has been giving me some issues lately. First, I had the adblue heater replaced. Now, I am getting an intermittent check engine light with a generic code of P2BAA, which is a code in which I understand is relating to the emissions system. I will say that this code has been more commonly seen in colder weather, lets say 30 degrees and below. I have noticed exhaust fumes (only a slight smell of diesel) at the rear of the car. I also have pulled codes from Carly for Mercedes from my iPhone app. The code I got was " Code: OBD 0A P2BAA
- Fault: The lower limit value for long-term adaptation of the SCR exhaust aftertreatment system was dropped below."- I spoke with my dealer, they think it is either a faulty SCR or NOx sensors?? They aren't sure and have said it would be roughly 2k to do the repairs. Also, they found that my oil cooler lines are leaking a little but don't need to be replaced yet? Another 2k repair?

Any ideas on the codes? Could it be from bad diesel? The first time the code appeared was right after filling the car up at a sketchy diesel pump... it was the only one nearby and I needed fuel.

I appreciate any comments.

Matt

Maj. Dundee

The code you posted in not a valid M/B code which are six digits long and do not use "P" for the eng.

You need a scanner which will read all modules.

mcwattsbenz

Maj. Dundee

Here is a sample of M/B six digit codes for diesel engines, which is 30 pages long.

victor.b

Hi
Thank you for your comment. I suspected a problem, but was not sure if I should pay attention to it.

mcwattsbenz

Here is the code I have been getting.

Fault: The lower limit value for long-term adaptation of the SCR exhaust aftertreatment system was dropped below.
- Code: 106200

vladimir.cdi

many possible reasons for that code:
- NOx sensor out of range
- AdBlue injector problem
- AdBlue pressure not OK
- AdBlue liquid quality is not OK

dealers definately can fix this, can be expensive btw if not covered by warranty
as inexpensive alternative you can order bypass device
contact me via pm if you are interested

mcwattsbenz

Thanks! But I want to keep my car as stock as possible, it sounds like a good plan, though! The car actually is at the dealer now for a diagnostic test, it went three months drama free until last night the the CEL came on again.