Another NOX sensor/Adblue delete story (good outcome)

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Slartibartfast

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Location
Sittingbourne, Kent
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W221 S350L, R231 SL350 & SL400
This is just some info for others with NOX sensor problems:

After I bought my car (2011 S350L W221) in September 2021 the engine management light would illuminate during journeys that were over an hour and a half. The code was always "P062F: Internal Control Module EEPROM Error". When I researched this I found it may be caused by a previous remap. I would delete the code and it may (or may not) come back on again on another long journey.

I decided that as I was planning to keep the car I would get the diesel software update done which may better identify and eliminate this error. I booked the car into my local MB dealership and had a discussion with the service manager regarding the possibility of NOX sensor failure following the update. As my car had full MB dealer service history he assured me that if the NOX sensors showed as faulty, they would be replaced FOC.

After the Diesel Software Update was done I was contacted by the dealer who informed me that the Adblue control unit was missing and the car wouldn't start until it was reinstalled. Looks like one of the previous owners had performed Adblue delete! I authorised the necessary replacement Adblue control unit (£500!). When this was done I was informed that the Upstream NOX sensor was faulty and needed replacing and they needed to get authorisation from MBUK for this to be done FOC. After a couple of days back and forward the FOC approval was granted and the NOX sensor replaced.

A few days later the EML came on showing "P2201: Nox Sensor Circuit Range/Performance Bank Sensor 1" on my icarsoft scanner. I booked it in to the MB dealer for their STAR diagnostic. They agreed that the other NOX sensor was indeed faulty and they once again got authorisation from MBUK for FOC replacement. Booked it in for 16th Jan.

Although the car had Adblue delete this wasn't detected on the 2 services and 2 MOTs since my ownership.
 
I didn't think 2011 cars had Adblue? Surely it wasn't added as part of the diesel software update, I've not heard of that before.
 
Thanks, you learn something very day: accepting that new technology has often been introduced on the S-class, it (AdBlue) was obviously introduced earlier than I thought.
I think MB introduced the adblue system on a few of their models in 2009 (in the States)
 
Why on earth did you do that 🤣

AdBlue 🤦🏻‍♂️

My 2018 2.1 diesel CLA doesnt have AdBlue and i'm buzzing about it. Also won't be going to Merc for their emissons update that they keep pestering me about either
 
Why on earth did you do that 🤣

AdBlue 🤦🏻‍♂️
I believe that it is not strictly legal to delete an adblue system from a car that has it fitted from new (except for off road use). It may also have insurance implications as the car has been modified.
No judgement on anyone who does the Adblue delete but it's not something I would want to do.
👍
 
I believe that it is not strictly legal to delete an adblue system from a car that has it fitted from new (except for off road use). It may also have insurance implications as the car has been modified.
No judgement on anyone who does the Adblue delete but it's not something I would want to do.
👍
I didn't do an AdBlue delete. My car didn't have one from the factory which was a pleasant suprise. I would of thought a 2018 would of had one.
 
I didn't do an AdBlue delete. My car didn't have one from the factory which was a pleasant suprise. I would of thought a 2018 would of had one.

Does it have the 1.5L dCI Renault engine? Or the BluedCi engin If so, then this probably explains it. The 1.8L and the 2.1L had the OM651 engine.
 
“Have” not ”of”. My pet hate!
Indeed. I wonder how long it will be before there is a new verb introduced to the english language "to of"
I of, you of, he of......
Then "would of" would make sense......
 
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Grammar Police
We are English speakers, we were taught English in school, we communicate in English, "must of" is not English. It is a lazy bastardisation of "must've"
“Must've” is simply a contraction of “must have.” Combining the words like this is fine in less formal writing or speech and makes grammatical sense. “Must of,” on the other hand, is almost always a mistake.


BTW, it is easier to admit your error rather than resorting to name calling. Just saying,like.
 
Indeed. I wonder how long it will be before there is a new verb introduced to the english language "to of"
I of, you of, he of......
Then "would of" would make sense......


Indeed:

 
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We are English speakers, we were taught English in school, we communicate in English, "must of" is not English. It is a lazy bastardisation of "must've"
“Must've” is simply a contraction of “must have.” Combining the words like this is fine in less formal writing or speech and makes grammatical sense. “Must of,” on the other hand, is almost always a mistake.


BTW, it is easier to admit your error rather than resorting to name calling. Just saying,like.
I would apologise if I actually cared

Schooled by old blokes on an Internet forum
 
I would apologise if I actually cared

Schooled by old blokes on an Internet forum

I say must of all the time , 😂 call the cops ..

Jenny must of lost her job , not seen her go out all week .
 
Does it have the 1.5L dCI Renault engine? Or the BluedCi engin If so, then this probably explains it. The 1.8L and the 2.1L had the OM651 engine.
My 2015 c250 didn't use ad blue 💙
 

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