Ad blue issue

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Glccoupe

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Joined
Oct 7, 2023
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11
Location
Kent
Car
Mercedes glc coupe
Hi people, has anyone had any issues with their mercs and ad blue at all ? My father's c class has suddenly stopped reading the true level of the ad blue after putting a whole big bottle in ?

Anyone experienced this and how it's to be fixed ?

Thanks
 
Last edited:
Lots of people have had lots of adblu issues, try a search on this site.
 
Hi people, has anyone had any issues with their mercs and ad blue at all ? My father's c class has suddenly stopped reading the true level of the ad blue after putting a whole big bottle in ?

Anyone experienced this and how it's to be fixed ?

Thanks

Unfortunately this could be the start of a long and expensive saga.

The dealer will most likely propose a new AdBlue level sensor - which only comes with the whole AdBlue tank - and cost around a grand.

You'll be better off finding an independent specialist who might be able to clean the sensor - sometimes the AdBlue crystallises - but even if you do need a new tank, the specialist will be much cheaper than the dealer.

What you can't do is ignore the problem... because at some point it will start telling you that you have only 500 miles before the car won't let you start the engine again.

EDIT: How old is the car? When was it bought? Is there any warranty?
 
OP , hello . Your question 'has anyone had issues has anyone had any issues with their mercs and ad blue at all ? Is a familiar one .

And I think the answer is a resounding 'YES !' I am sorry to say. It seems to be a badly flawed system.
 
Unfortunately this could be the start of a long and expensive saga.

The dealer will most likely propose a new AdBlue level sensor - which only comes with the whole AdBlue tank - and cost around a grand.

You'll be better off finding an independent specialist who might be able to clean the sensor - sometimes the AdBlue crystallises - but even if you do need a new tank, the specialist will be much cheaper than the dealer.

What you can't do is ignore the problem... because at some point it will start telling you that you have only 500 miles before the car won't let you start the engine again.

EDIT: How old is the car? When was it bought? Is there any warranty?
Hi Mark, yes we've heard about the ad blue crystal issue so could be a matter of getting it cleaned

It's a 2017 c class


Cheers
 
Hi Mark, yes we've heard about the ad blue crystal issue so could be a matter of getting it cleaned

It's a 2017 c class


Cheers
You can buy adblue anti crystallising additives as well .
 
My 2916 250d with the diesel software update and fuelled using Esso Supreme had the same problem last year. Topped up the Adblue and the level reading on the dash did not move. Fearing trouble I added a bottle of Forte Adblue conditioner hoping it would recrystallise any build up on the tank sensor to no avail. Ran for a few thousand miles and the level did not change. Prior to annual service at MB put another bottle of Forte into the tank. The tank at this time by past records should have about 12l of Adblue left. Did not mention Adblue to garage. When I collected the car service sheet recorded Adblue filled up along with the normal service items. Driving away I checked Adblue level, reading now showing fill with 8K range. This year the range has dropped by 100 miles for each 300 miles covered ( mainly long motorway runs) and the graphic has slowly fallen in line with consumption.
Not sure if Forte additive had cleaned the system or the garage reset the Adblue level at the service. Will keep up with the additive as the £12 or so a bottle may be keeping the system in good condition and as far as I can tell it’s not caused any problems.
 

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