Kenny32

Hi Dave, It is a cheap one tbh, though it did successfully identify a faulty sensor elsewhere in the past. I’ve had no EML come up and not noticed any issues with performance, which is why was a bit suspicious of the mechanic, as NOX sensors are so expensive (though as you say definitely something wrong with lambda reading) perfect thanks for the recommendation, I’ll have a look at that site. I’ll have a look at a youtube video as well, though not my strongest area of expertise!

yeah it is a generic cheap scanner to be honest. O wow I really hope that doesn’t happen to me haha! Not great with spanners. That does make me feel better though knowing it could be the issue though. Just wanted to make sure the mechanic isn’t taking me to the cleaners getting work I don’t need. appreciate the help.

Looking for a bit of advice. My 2012 BMW 1 series Msport (72000 miles) just failed its MOT on emissions as the lambda was too high. The garage said they ran diagnostic and the NOX sensor needs replacing. This is quite an expensive job (£620 including parts, labour, VAT ect). I’ve said I’ll have a think and took the car home and ran my own OBD diagnostic tool on the car. My concern is no error codes have come up. I took the car to another garage for an emissions test and they did confirm the lambda is too high to pass MOT. My question is, is it possible for the NOX sensor to be causing the emissions test to fail when it is not showing up as an error on my diagnostic tool?

Looking for a bit of advice. My 2012 BMW 1 series Msport (72000 miles) just failed its MOT on emissions as the lambda was too high. The garage said they ran diagnostic and the NOX sensor needs replacing. This is quite an expensive job (£620 including parts, labour, VAT ect). I’ve said I’ll have a think and took the car home and ran my own OBD diagnostic tool on the car. My concern is no error codes have come up. I took the car to another garage for an emissions test and they did confirm the lambda is too high to pass MOT. My question is, is it possible for the NOX sensor to be causing the emissions test to fail when it is not showing up as an error on my diagnostic tool?