Yesterday wrestled the new NOx sensor into place. What a pain, the panels under the car all overlap in a very awkward way and I needed to take off like 25 fasteners in a shower of sand, salt and whatever else it picked up over the years. Ugh!

Finally got to the connector and put the new one in. Tried to read the output in ISTA but no such thing, you need to get it out on the road coz the system won't enable the sensor readings until the temp at the SCR injector is at 150 degC. So, buttoned her up and off I went, but no amount of temp or driving would release the reading of the rear NOx sensor. Tried re-initializing the SCR and clearing the codes but nothing helped. Eventually started to suspect the "new to me sensor of 50k miles" might not be working.

Fortunately I had bought a second one with 35k miles (total coincidence) that arrived just as I was putting the first one in the exhaust pipe. So, last thing I did yesterday was put it back on the jack stands and undo all the "wonderful" screws again.

This morning got item nr. 2 in place and decided to simply warm it up before connecting to ISTA. Took a good 30 minute drive (w/o CEL appearing) and then connected to ISTA. First thing I did was reset the SCR system which initializes the NOx sensors (both initialized successfully). Then looked at the readouts which were normal!! At last it seems to be working as advertised.

Now just need to do an oil change, remove the Euro hitch and install the US version (OEM) and put a couple of decent tires on, then she is ready to be listed.


SF2000x5 - I asked the alignment shop to give me 1.0 deg camber and .01-.02 toe-in, matched side to side. Please read postings by ARD on the topic, there a quite a few and I like his logic. Then choose what specs you want to use.

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2003 4.4i black ext./black int./black headliner (kid's runabout)
2014 535d X-drive, M package, silver/black interior

Sold but not forgotten:
2009 E70 35d, black ext./black int./black headliner (sold 2021)
2006 4.8iS Le Mans blue/cream int./black headliner, SOLD in 2012 sadly...

Other hardware:
2015 Cayenne S (wife's new DD and definitely wroooommmmm)
2016 Tundra 1794 edition crew cab, luxo hauler
2005 Tundra crew cab, weekend hauler. Sold after 150k very happy miles.