Adblue problem

TheRealChrisP

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C CLASS COUPE 250 2017
Car is in at my long time garage, fingers crossed it’s the problem as discussed above. I’ll let you know how I get on.
 

Mark1974

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W205 2015 C180 bluetec 1.6 Diesel
Car is in at my long time garage, fingers crossed it’s the problem as discussed above. I’ll let you know how I get on.
Hopefully that'll fix it...looked it up ..it's called the adblue metering valve. So hopefully it is blocked with calcified adblue and a clean out fixes the issue.
 

TheRealChrisP

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C CLASS COUPE 250 2017
So, it was blocked and has now been cleared but unfortunately didn’t clear the fault. There is still an error code relating to the nox sensor. Having to pay Mercedes £200 plus vat for a software update in the hope that it clears the fault but if not, looks like a new nox sensor is required at about £700. Apparently the software update would need doing if I replaced the nox sensor so makes sense to do it first. Fingers crossed.
 

TheRealChrisP

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He did say if the update doesn’t work, he could reset the fault and then I could wait and see how long it takes for it to come back on. At least if I do that I’ll have another 500 miles to play with before engine shut off.
 

TheRealChrisP

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C CLASS COUPE 250 2017
Well the software update cleared the error message so no more dreaded countdown. Not sure how I feel to be honest, do I have a dodgy nox sensor or not? Am I just waiting for the error message to return? I guess I’ll just enjoy the car and wait and see.
 

Mark1974

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W205 2015 C180 bluetec 1.6 Diesel
I'd drive it on ... And wait and see... I did get a separate nox related code only last week but nothing has come up re adblue levels etc since January
 

TheRealChrisP

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C CLASS COUPE 250 2017
Curiously my stop start has started working again. Perhaps that was a software issue and not a drained battery through lack of use during lockdown as I suspected.
 

Mark1974

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Carlow, Ireland
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W205 2015 C180 bluetec 1.6 Diesel
Curiously my stop start has started working again. Perhaps that was a software issue and not a drained battery through lack of use during lockdown as I suspected.
That's gas I had something similar ... Although in the main I think it has a separate battery or more of a storage capacity device for stop start. I think the nox sensors in general are a prob with these ... I got a software update before my adblue issue...so I wouldn't be surprised if I get a nox issue again, Mercedes website states they should replace your sensors when they do the update IF necessary...the IF being key word.... but I think the job I had done and you just had done, clearing out the calcified adblue from the metering valve, will sort your adblue issue
 

Mark1974

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W205 2015 C180 bluetec 1.6 Diesel
Hey another way to look at it is you've possibly just saved 000's on a simple fix ... Definitely a reason for a trip to the pub ...now that they're open ...of course still have to sit outside here in Ireland ...typical
 

GDS63

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gkc170mhs
Car is in at my long time garage, fingers crossed it’s the problem as discussed above. I’ll let you know how I get on.
Be interested if this happens again. I had a software update, then got an adblue warning, with engine warning light. On holiday in Wales, had to pay for a fix. On the way back from Wales - same problem, and going in to my local MB dealer for another fix. Annoying. Sure it is an MB software/hardware issue...
 


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