Potrice

Hey everyone,

I finally solved all of the problems on my ML, but it seems to be my brother in law’s turn to get hit with a check engine light! His ML350 bluetec is also a 2013 but he has about 130 000 km. I used my obd2 Bluetooth reader app and he’s getting the P2200 code which seems to indicate the Nox sensor in bank 1 is faulty. Does anyone have a WIS or diagram of this? I plan on doing the work on his ML and this shouldn’t be very difficult. I also have a couple of questions:

1- He said he changed both nox sensors under warranty back when the suv had ~40 000km. Is it possible that the nox sensors are already faulty? They don’t seem to be the root of the problem. I was thinking, would it be possible that the EGR is filled with carbon deposits? He has never cleaned them (supposedly MB now recommends to clean them every 40 000 miles or 60 000km) but he says the suv runs great. Would it be possible that a nearly clogged EGR have a big impact on nox sensors lifespan? Am I just talking out of my butt here? Come to think of it, my ML has 175 000 km and I never cleaned the EGR, but mine seems to run fine as well...I’m scared that it will kill my nox sensors soon.

2- Do the nox sensors have to be “learned” with a STAR diagnostic tool or is it a simple plug and play? I’ve seen posts/threads on this matter, but nothing was quite decisive (some said yes others said no).

Thank you in advance guys!

zemun1234

I have changed my NoX sensors. I forgot what code I got (it could be same as yours) but I have replaced BOTH sensors due to usually after first, you need replace second.

Also, I think the new sensors have different part #. As for buying sensors, I suggest to purchase them in USA - the cost in Canada is $836 + 13 % tax vs 320 USD (front Nox) / 380 USD (rear NoX).
My car is still new but for sure I am planning go with delete route (adBlue, NoX sensors,...)

It is correct - you need adaption with STAR diagnostic (it should be done online which it is not free). I think somebody said that it is not required but I paid 2 hours extra for this (also, it could be reason why I have changed both in same time - not paying second time for 'adaptation').

A.

Potrice

Thank you for the very informative reply.

Potrice

Update: It seems that he's getting the Adblue message with 8 starts remaining + code P2BAD and permanent codes P2200 and P2201. Is it possible that a nox sensor can cause X amounts of start left with the adblue message? His adblue tank is full.

Also, P2201 is for the front Nox sensor right? P2202 stands for the rear one?

Babukb2

i had nox sensor issues last spring, my codes were Mercedes specific codes, not the generic P ones but here were my codes and what it said...
18B800 and 18B900
"the difference between the measured signal and the calculated signal of the nox sensor downstream of the scr catalytic converter is too great"
the other code was the same just upstream sensor instead of downstream

i reset these codes myself, but they eventually came back, even after resetting another 1 or 2 times. not once did i have a X starts remaining displayed though, and i drove around almost a month. 2 nox sensors were replaced eventually and the problem was gone and never came back.

hope this info helps

Potrice

So I just called the dealer to confirm the correct Nox Sensor part numbers before ordering them online. The dealer said to me the front NOx sensor part number is 0009055106 priced at 836.92$ CAD and the rear NOx sensor is 0009053706 priced at 836.92$ CAD. However, on eBay and other websites, the codes are 000 905 35 03 for the front and 000 905 36 03 for the rear one.

What's going on here? Is it possible that MB came out with newly updated NOx sensors? Has the dealer made an error?

Update: Called another dealer and he said that the 0009053606 is the code for the front one and that they have been upgraded to 0009055106. Not sure what was changed about them. He also said that the NOx sensors don't have to be learned. Just plug n play. ???????? So many different information from one dealership to another...

Potrice

So I just called the dealer to confirm the correct Nox Sensor part numbers before ordering them online. The dealer said to me the front NOx sensor part number is 0009055106 priced at 836.92$ CAD and the rear NOx sensor is 0009053706 priced at 836.92$ CAD. However, on eBay and other websites, the codes are 000 905 35 03 for the front and 000 905 36 03 for the rear one.




What's going on here? Is it possible that MB came out with newly updated NOx sensors? Has the dealer made an error?




Update: Called another dealer and he said that the 0009053606 is the code for the front one and that they have been upgraded to 0009055106. Not sure what was changed about them. He also said that the NOx sensors don't have to be learned. Just plug n play. ???????? So many different information from one dealership to another... ​​​​​​​

peter2772000

That sure cleared everything up...

Potrice

Has anyone ordered the Nox sensors online? If so, what are the part numbers for both sensors (front and rear)?

Potrice

I ordered these 2 sensors online.

Front Nox Sensor =
Rear Nox Sensor =
For the front nox sensor, the number is ending with 3503 and the rear nox sensor is ending with 3603. The suv was getting P2200 and P2201 for the front nox sensor, but I changed both to make sure. The rear nox sensor was easy to change but the front one was trickier. You had to pass it behind the heat shield, but not a big job nevertheless. I cleared the codes and the check engine light is gone. Hasn't been back in over 250km. I didn't go to a dealer and calibrate/learn them. Time will tell if I have to. I'll report back if it comes back.