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[Andy B]

I assume the NOx sensor is at the red arrow  I recently replaced the clamp at the blue arrow & used a little exhaust paste. Any connection?

[Andy B]

..

[Doctor Gollum]

It's certainly something to consider 

[Marks DTM Calib]

Looks to be the post SCR NOx sensor (there are is likely two, one between the DPF and SCR, the other post the SCR) and guessing the clamp is downstream of that, so I would say you are ok

[Marks DTM Calib]

Scratch that, zoming in it appears to be the pre-SCR NOx, I can see what looks to be the post-SCR NOx close to the clamp

[Doctor Gollum]

The clamp is forward by the transfer case.

https://www.ebay.co.uk/itm/236782221032?_ul=GB&mkevt=1&mkcid=1&mkrid=710-53481-19255-0&campid=5338990947&toolid=10001&customid=eb%3Ag%3Avms%3Aeb%3Ap%3A236782221032%3B{GCLID}&adtype=pla&loc_interest_ms=&loc_physical_ms=9045815&gbraid=0AAAAADmMgijAZlhgyivvwQNHwaVDa2mdw&gclid=Cj0KCQjw_b_QBhCSARIsAP6hR4cQoTn1aQZztYmZIVh5PgU8LsnxIaLWkbN0SrQ1QWtzZ_6eSogIbj4aAv4NEALw_wcB

This should be the image of the back of the engine. The extra sensors missing on EU4 is between the EGR and turbo heat shield.

[TheBoy]

Chap next door has a '17 CLS 350 and he's been quite careful regarding where he buys and how he store adblue for his car. He topped it up recently and noticed as he was filling it that it didn't look right. He's added some anti crystal to it with fingers very much crossed.

He has noted that because it doesn't have a gauge it's almost impossible to guess the fluid level when the warning pops up and therefore how not to overfill it... So simply adds a couple of litres or three each time.

We keep our AdBlue in the utility room, and don't buy from petrol forecourts where its in the sun and frost, for that reason.

Hers is a crappy 9l tank, so when the warning pops up, we put in 5l

[Andy B]

This is the other side of the clamp ... there is a sensor there too ... no idea what it is