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NoX sensor

19697 Views 15 Replies 6 Participants Last post by  dustinsteve3859
Hi all, just putting the feelers out for anyone with any experience of NoX sensor problems. The Carly app has throw up the following codes:
Engine / Motor
Nitrogen oxide sensor electrically
Code: 2AF4

Nitrogen oxide sensor lambda
Code: 2AF2

Nitrogen oxide sensor power supply
Code: 2AF6
If I clear codes they come back eventually. When I log the parameters within Carly I get the following.

Seems im getting nothing for nox sensor but it did show nox concentration? In for MOT on Thursday so will see if I get hit for emissions. Nox sensor looking like a costly part at 354.00 from Cotswold!

BMW e87 2.0 2011

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I'm pretty sure I remember reading that most of the 2.0 (petrol) have a nox fault stored unless the car is thrashed. Clear it, take it for a hard drive and see if it comes back.
0l0dom0l0 said:
I'm pretty sure I remember reading that most of the 2.0 (petrol) have a nox fault stored unless the car is thrashed. Clear it, take it for a hard drive and see if it comes back.
I'll give that a go, thanks.

BMW e87 2.0 2011
hi I had the same faults codes for my n43

30ea denox catalytic converter, sulphurised
2af4 nox sensor electric
2af2 nox sensor linear
2af6 nox sensor binary
2af9 nox sensor, nox signal: coast mode check

that's what I had. the 2af2,4 and 6 was a broken nox sensor (not cheap to buy) once replaced them codes have never come back.

the 30ea code only went after a motorway run but then came back. since moving house and using the motorway every day to commute to work the 30ea code has not returned.
dh131286 said:
hi I had the same faults codes for my n43

30ea denox catalytic converter, sulphurised
2af4 nox sensor electric
2af2 nox sensor linear
2af6 nox sensor binary
2af9 nox sensor, nox signal: coast mode check

that's what I had. the 2af2,4 and 6 was a broken nox sensor (not cheap to buy) once replaced them codes have never come back.

the 30ea code only went after a motorway run but then came back. since moving house and using the motorway every day to commute to work the 30ea code has not returned.
Ah OK thanks for that, was thinking it was going to be the sensor. Not a cheap part either. I'll see if it goes through the emissions test on the MOT tomorrow and go from there. Either way looks like I'll be parting with some cash on this one. Thanks all, I'll update with the outcome.

BMW e87 2.0 2011
Garage confirmed nox sensor has failed, it just scrapped through the MOT on emissions [FACE WITH COLD SWEAT]. Now looking for a reasonably priced new one. Some come up on eBay from time to time so think that's where I'll get one. Don't fancy paying 350 from the stealers.

BMW e87 2.0 2011
Hendy said:
Garage confirmed nox sensor has failed, it just scrapped through the MOT on emissions [FACE WITH COLD SWEAT]. Now looking for a reasonably priced new one. Some come up on eBay from time to time so think that's where I'll get one. Don't fancy paying 350 from the stealers.

BMW e87 2.0 2011
don't know if you bought a sensor yet but eurocarparts are selling them for £350 but have 10% off this weekend so its £315 until midnight sunday. I bought mine from eurocarparts and it was in a bmw branded box!
Ok thanks, good to know as on the verge of getting one. Cheers

BMW e87 2.0 2011
I'm in the exact same situation. If I buy one is it an easy job for the garage to do?
Yes not difficult once up of the ramp.

BMW e87 2.0 2011
Maybe we should start a group buy [UNAMUSED FACE]

BMW e87 2.0 2011
Hendy said:
Garage confirmed nox sensor has failed, it just scrapped through the MOT on emissions [FACE WITH COLD SWEAT]. Now looking for a reasonably priced new one. Some come up on eBay from time to time so think that's where I'll get one. Don't fancy paying 350 from the stealers.

BMW e87 2.0 2011
Just changed the NOX sensor, same fault codes as you. I sourced a part from a company called 'Genuine Autoparts' registered in Australia but shipped from Germany. I was a bit aprehensive so paid via PayPal just in case anything went wrong. I exchanged a few emails with them before placing the order and was happy with their response. I ordered it on Monday, arrived Friday via UPS. Genuine BMW part, £269.62.
I have no connection with the company but thought a saving of £100 was worth passing on.
Also I like to add that it runs smoother, petrol consumption has improved and stop/start has started working!
Aycee said:
Hendy said:
Garage confirmed nox sensor has failed, it just scrapped through the MOT on emissions [FACE WITH COLD SWEAT]. Now looking for a reasonably priced new one. Some come up on eBay from time to time so think that's where I'll get one. Don't fancy paying 350 from the stealers.

BMW e87 2.0 2011
Just changed the NOX sensor, same fault codes as you. I sourced a part from a company called 'Genuine Autoparts' registered in Australia but shipped from Germany. I was a bit aprehensive so paid via PayPal just in case anything went wrong. I exchanged a few emails with them before placing the order and was happy with their response. I ordered it on Monday, arrived Friday via UPS. Genuine BMW part, £269.62.
I have no connection with the company but thought a saving of £100 was worth passing on.
That's a good price. I'll remember them for the next sensor that goes. I ended up getting it from euro parts for 315.00. Thanks for the info.

BMW e87 2.0 2011
I myself experienced an improved ratio in fuel consumption after replacing the nox sensor. I got this one in cheap rates with one year of warranty as well.
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