PurpleS500

Hello everyone ,

i been having this code come up , P22A1 ( DTC definitions not found ! Please refere to vehicle service manual )

goes away and can erase but check engine light comes on. Any specific idea on what can it be .
Did a search no search found

Thanks !

Rainers

P22A1

P22A1 OBD Code Definition:
NOx Sensor Circuit High (Bank 1 Sensor 2)

PurpleS500

meaning oxygen sensor ?

pcy

yup. Bank 1, post cat.

mikel212

Definition of check engine code P22A1:

Generic

Nitrogen oxides (NOx) sensor 2. bank 1 - circuit high


You have a Bluetec? I just had both NOx sensors replaced (under warranty). Not a cheap fix....about $450 a piece, excluding labor

PurpleS500

one before the cat or by the engine ? Got a part nimbler if you preformed this issue so can order it online before taking it to a shop ? Or just have em do it ?

thanks for clearing it out know in what it is

PurpleS500

yeo a bluetec , dam I'm out of Warrenty :/ so I'm lucked out lol . Do have a part number from your receipt perhaps ? This way I'll order one hopefully don't need both

thank you you for your reply to help me out figure this check engine light that comes on time to time

mikel212

This is a 2013 Blutec ML350 wtih 48k miles, UPDATED part number is:
000-905-36-06
000-905-37-06-28

I believe there is an updated and an older part number.

Dont know which is front and which is rear. I was able to clear my engine light, but I came back on the next day. Are you saying that your light comes on from time to time?

I would be sure before replacing the NOx sensor. They are pretty expensive and dont know if you can return them.

I had a different error code, so this is pretty generic. It can be anything from low DEF solution to bad Cat. Straight out of my butt, but hows your DEF level. Maybe you should pour two gallons in and see if the light is still on.

HAILERS2

I had both replaced last month by the dealer on a ML350 Bluetec, 2014 with 73K on it. Those were NOX sensors, not the oxygen sensors.

Two different part numbers for the NOX sensors: 000- 905-35-03 and 000-905-36-03. Which is front and which is rear? Got me. If I was interested I could Google both parts and then know.

It says on my invoice that "Found both front and rear NOX sensors faulty due to an internal short. Removed and replaced both".

Before I had this done, I Googled NOX sensors for my car and came upon a thread on another MB forum. This guy said he had a problem with the NOX sensor , I believe in the front, and the problem was water intrusion into the wiring harness/plug of the sensor coming from the a/c discharge. I shoulda but DID NOT mention this to my service advisor. SHOULDA. It's not likely both sensors went bad at the same time. i'll never know. I've seen this done in aircraft'n. Remove and replace the most likely bad actor type thing. The service advisor did call me and tell me what they were changeing and said their 'output' was confusing/irregular/whatever he said. All's well now.

As for adding more urea......I did that but it made no sense. If it was low, you''d get a caution light saying so. CAn't hurt though.

Oh, the parts cost $543.00 and $582.00. Labor cost was something else, 'cause mechanic need a good 401K and health benefits and have car payments and house payment to make to say nothing about the 'girl friend' the wife knows not about.

Maybe should have done it myself. Righty tighty, lefty loosy. Sounds easy as long as you don't have to interface witht the MB computer for some reason afterwards.
http://www.mboemparts.com/mercedes-b...rt_name=sensor

Gee, the cost is cheaper at the site above these words. Who'da thought.