W205 2014 engine management light

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Andyp1854

New Member
Joined
Feb 7, 2021
Messages
3
Location
Manchester
Car
2014 c class c220
Hi
New to MB hoping someone can help
2014 w205 c220 d
Driving home Friday engine management light came on plugged in a cheap reader and it came up with code P13DF. What I can figure out is low Adblue but no warning light on dash, I put about 17 ltr in, cleared light but comes back on ? Gave it a 30 mile hard run and left it running for a hour
Restarted and light gone of went back out 1 hour later back on
Can anybody shed any light or answers please
 
Did have a problem with a box sensor last year when I bought it but garage supposed to have changed it
Looks like they just knocked the light of
 
There are 2 nox sensors and have been modified several times but there are a number of faults that will trigger that warning.
 

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