[eddiem74]

I have a March 2008 E92 325i N53. I purchased the car in November 2011 and had the NOx Sensor replaced and also had seen in the prior owners documentation that he also had it replaced under goodwill a couple of years earlier.

Looking on Realoem, I see the part has gone through a fair few revisions.

NOX sensor 11787565447 ENDED
NOX sensor 11787576908 ENDED
NOX sensor 11787580518 ENDED
NOX sensor 11787582327 ENDED
NOX sensor 11787587128 ENDED
NOX sensor 11787587129 CURRENT

I just had the injectors replaced via dealer and as this NOx showed in diagnostics again the dealer said they would contact BMW and see what they say as this would be the 3rd replacement. This is what the dealer emailed me:

"Bmw replied with regarding the NOX sensor fault, they have suggested running a number of checks on the car including a wiring check with the NOX and inspecting the Nox condition before proceeding any further, they have recommended once doing the checks then reporting back our findings if any before they can give us reasons why the nox has shown faults."

Why do you make of the above? Feels like possible extra cost if no goodwill at the end?

I asked the dealer for the best price on the part to look at just getting it replaced however while they would do it they are saying "because this has been replaced on 2 other occasions I would not recommend on replacing until we do all the other checks that is being recommended, we do not replace a great amount of these, in 2013 we replaced in total 4 Nox sensors on this model. It is an expensive part to replace without doing the checks."

So if I do the checks I potentially have the cost of checks, NOx sensor and diagnostics or I could just replace the sensor?

Interested in peoples experiences and advice?

[rhysh1990]

Bmw replaced my 6 injectors and NOx sensor on my n53 330i earlier this year under goodwill - they covered parts but i paid labour

[eddiem74]

Originally Posted by rhysh1990

Bmw replaced my 6 injectors and NOx sensor on my n53 330i earlier this year under goodwill - they covered parts but i paid labour

Well goodwill was refused on the injectors and won't be entertained without doing the above investigation on the NOx Sensor which may still result in me having to pay the extra on top of replacing the part.

That is why I am interested in if forum members have theirs replaced and if so more than once or not?

[Russbmw]

The one in my wifes 320 borked at just over 100k miles. £300 for the part, but replacement is DIYable, albeit a bit of a pain in the ass. Adaptations need resetting afterwards, but this can be done with EasyDIS/GT1

[eddiem74]

Originally Posted by Russbmw

The one in my wifes 320 borked at just over 100k miles. £300 for the part, but replacement is DIYable, albeit a bit of a pain in the ass. Adaptations need resetting afterwards, but this can be done with EasyDIS/GT1

This would be the 3rd sensor on the car and it's only at 87k miles?

That's why I am trying to get a sense of how problematic these sensors are and how frequently people have gotten them replaced?

[Drrncour]

Had my nox sensor changed and made no dirrerence to the running of the car. Turned out to be the injectors that were the problem.

[Russbmw]

Originally Posted by eddiem74

This would be the 3rd sensor on the car and it's only at 87k miles?

That's why I am trying to get a sense of how problematic these sensors are and how frequently people have gotten them replaced?

Same here the NOx sensor made no difference to the running/performance at all.

If you've had 3, I'd say there's something wrong. I gather they usually shit themselves when the fuelling is all to pot.

[Drrncour]

Originally Posted by Russbmw

Same here the NOx sensor made no difference to the running/performance at all.

If you've had 3, I'd say there's something wrong. I gather they usually shit themselves when the fuelling is all to pot.

Good point as had the hpfp done at the same time, could be this common problem

[rhysh1990]

Yeah i had 3 and the NOx sensor done in january and then the car started playing up again in march and they then replaced the other 3. Gutted i had to pay labour twice lol but cant complain really

[eddiem74]

It's my understanding that not replacing the sensor can cause the NOx Cat to block and can also lead to poor fuel consumption?