Update: U059f/DTCC59F code still there, however, I added a 1.5L bottle of adblue and level went up to 92% so seems as though all is well with the level sensor. Took it on a long drive around the m25 and monitored the cat temps which reached >600°c confirming it was successfully completing active regen.

Spent a few hours today removing the front sensor. Was heavily ceased, took a lot of persuasion, map gas, penetratinf fluid and brake cleaner to get it removed. Threads were really bad when removed. Tested voltage at frobt NOx plug: 12v on supply, 2.4v on can low and 2.7v on can high, low resistance on ground wire so all good at the plug.

Reluctant to spend more money on it, however, seems like it's gonna need front NOx sensor by looks of things. I wonder if the scanner is wrongly referring to the upstream NOx sensor as position 2, when in fact the fault is with the upstream sensor. Who knows, but £500 on sensors is never fun...

 

Hi Tom
i know its an old ish thread but where is the front upstream nox sensor located can only see one situated just behind the dpf which I assume is sensor 2 downstream
Regards

 

For my 2017 trafix, NOx sensor 2 (position B) was actually the upstream sensor which is just infront of the adblue injector. Sensor 1 was the downstream.

Doesn't make any logical sense other than what I could deduce which was - euro 5 vans had only one Nox sensor (downstream, would have been no 1 first) and then a second was added upstream to allow adblue module to calculate dosage of ablue required by comparing upstream and downstream values.

Hope this helps.

Tom.

 

Thanks very much Tom 👍

 

Thank you