Behindthebins
Active Member
Please let me know which scanner you’ve ordered and whether it works ok
NOX sensor stats
- Thread starter JustmeJB
- Start date
JustmeJB
Active Member
I ended up getting the Launch Creader 3001 which is currently on offer for £25.
It does wipe the code but at the moment it only lasts one or two further drives. Interestingly it doesn't find any faults with the NOX sensors so given the ad blue level reading issue I am beginning to think it's the tank this time.
Great little reader though which I would recommend.
It does wipe the code but at the moment it only lasts one or two further drives. Interestingly it doesn't find any faults with the NOX sensors so given the ad blue level reading issue I am beginning to think it's the tank this time.
Great little reader though which I would recommend.
I was advised against it as you can end up creating a problem where there wasn't one..... But I guess if you know it's definitely a sensor going wrong, removal/cleaning shouldn't create further issues.
TC350
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What I've been saying is that I'm never certain that it's actually a sensor going wrong. Just because the software says it is doesn't mean that it really is. I suspect, but admitedly have no proof, that it's often limitations of the pre-programmed ECU that's not allowing for sufficient time for the sensor to be out of spec before generating a fault code. Otherwise why should my car run for a year or so without any error codes after clearance? The sensor isn't going to miraculously mend itself if it's broken, but it can clean itself under favourable conditions. That's why I favour letting the software settle over taking a sensor out and physically cleaning it - it may not go back in properly. The worst thing that could happen with ignoring fault warnings on such a sensor is that the car emits more NOx than expected.
jameswilliam81991
New Member
You are right, but doing this repeatedly might not fix your Nox sensor properly. You should look for a new sensor because this is a severe issue if you are searching for any kind of Nox sensor.
TC350
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Again, I have to query whether or not there's really a problem with the sensor itself or the software that monitors it? Puts me in mind of the very old story of the wheel tapper.
Cast train wheels used to be checked for cracks by hitting them with a hammer and listening for the tone of the ring. An expert ear could tell whether or not the wheel was cracked. In one reported incident several large expensive wheels were replaced before the wheel tapper realised his hammer was cracked.
JustmeJB
Active Member
I'm going to draft a suitably worded email to the Benz CEO and see if I get a reply when I tell him/her their cars are not fit for the purpose they are manufactured for. I suspect it won't be the first time but why the hell not.....wish me luck
I will back you up...
I honestly dont know how MB have got away without replacing these free...
They are a major known issue, im sure in the USA they are replaced free... We just seem to roll over in the UK.
Almost every 2014 onwards bluetec diesel car with an EML on or adblue warning is down to nox sensors... at £500-800 each time for each sensor fitted, its grossly unfair.
Petrols are affected too but not so much.
JustmeJB
Active Member
Thanks for the support. I'll let you know if I get a reply. I've heard there is a law suit or something going on in the US. I am surprised and annoyed that the majority of issues are with MB.
TC350
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Thousands have been replaced free in the UK. I had mine done free the first two times, then at 7 years old MBUK gave a £1,000 contribution.
rf065
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You're lucky, I've had none changed for free, Mercedes refused outright to contribute a single penny!
TC350
MB Enthusiast
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- C350 Sport saloon. Previously CLK230K and E260 saloon. 25 years Mercedes ownership.
Was it MBUK who refused or your Mercedes dealership? The dealership will put in a request on their computer link to MBUK that is set to automatically reject all requests. After this had happened to me I contacted MBUK directly and calmly explained that I knew of very many people (through this club) who had had them replaced foc. I also reminded them that my car had a full MB service history. They then notified my local dealership to carry out the work.
But each time I did have to pay the dealership a ridiculously high price to plug in their tester to confirm the fault code. There’s a process that has to be followed or you have no chance. How far beyond the three year new warranty they’ll go with paying probably depends on where the annual services have been done.
JustmeJB
Active Member
Mine is a mix of main dealer and indie. 82k miles on the clock and when I talked to the main dealer they mentioned that as it's so far out of warranty and with that kind of mileage there's no chance of any good will gesture. Not many years ago 82k on a merc would've been sold as "barely run in" 
rf065
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Both, one service at an Indy and they were just not interested.
I had the same issue. Bought a car (private) with full MBSH and few days later EML came on. Had it diagnosed (local garage) and said no2 NOX sensor failure. Called MBUk and asked me to take it to local MB Coventry garage to diagnose. I explained people have had them replaced free of charge if full MB history. MB Coventry diagnosed and said same thing. I explained that it should be replaced free of charge based on experience of members on this forum. They came back and said been escalated and would not do it for free and quoted me approx £800. Went through the complaint process with MBUK and basically said no and that I need to take it up with ombudsman.
I found a link in YT: in how to fix without replacing. Took it to a local garage and showed video in fixing this. Worked for a while but EML came on. I did have a friends diagnostic tool but it did not remove the NOX sensor fault. So got one from alibaba and been using that to remove EML every time it comes on.
I found a link in YT: in how to fix without replacing. Took it to a local garage and showed video in fixing this. Worked for a while but EML came on. I did have a friends diagnostic tool but it did not remove the NOX sensor fault. So got one from alibaba and been using that to remove EML every time it comes on.
JustmeJB
Active Member
Well after a bit of back and forth my car needs a new adblue tank. The pump has failed so they say it needs to be changed as a whole unit despite videos on youtube clearly showing the pump being changed on the same model car. So I'm going to find the part number and do it myself.
No luck in the end from Mercedes either. Their initial email response was positive but then turned very negative. The workshop front man was zero help and admitting that they get lots of the same issues and agreeing it's a flawed system. I asked what the solution was but nothing. I said if someone could give an answer as to how to avoid the issues whether that be additives, hard driving etc etc but he was completely non committal.
So if anyone knows the part number for the adblue pump for a 2017 e class e220 estate that would be awesome.
No luck in the end from Mercedes either. Their initial email response was positive but then turned very negative. The workshop front man was zero help and admitting that they get lots of the same issues and agreeing it's a flawed system. I asked what the solution was but nothing. I said if someone could give an answer as to how to avoid the issues whether that be additives, hard driving etc etc but he was completely non committal.
So if anyone knows the part number for the adblue pump for a 2017 e class e220 estate that would be awesome.
AdBlue issues is the Nr1 reason I buy the MB used aftermarket warranty - at £450 per year, any fix will quickly exceed that amount.
