fault code P204F96 Gle coupe 2017 350d

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Marvellous

New Member
Joined
Sep 7, 2020
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1
Location
london
Car
Mercedes Gle 2017 coupe 350d
Hi
I have fault code P204F96 The adblue (cylinder Bank 1) system has a malfunction. That the reading I had when i took the car to a garage after i filed up the adblue tank. issue did not go away. I had less than 200 miles before engine would not be able to start again. The system worked fine for a day after the fault code was cleared. when I started the car in the morning, issue had come back again. engine light came back on. I'm going to take out the nox sensor and clean it with a carbon fluid cleaner , i believe there is only one nox sensor upstream of the catalytic converter. If that does not work then i will have to take it to dealership. car not under warranty due to salvage car ( but unrecorded). Anyone have any information or fixs for this fault code?
 

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There are TWO Nox Sensors. One upstream and one downstream. Recently had both of mine replaced. Can't remember exactly... but cost over £1,500
 

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