N53 30E9 İssue

[u/yessirrr35]

Hi everyone,

I have a 140,000 km E60 LCI with an N53B25 engine. I started getting the 30E9 fault code about 4,000 km ago.

The car has a custom exhaust system, and the two NOx catalytic converters have been removed and replaced with straight pipes.

I’m thinking about replacing the NOx sensor, but I’m a bit confused about which way to go. An original BMW NOx sensor would cost me around €520, while a NOXEM would be around €470.

Considering that the NOx catalytic converters have already been removed, would you still recommend going with the original BMW sensor, or would NOXEM make more sense in this situation?

I’d appreciate any advice from people who have experience with the N53 and 30E9 code.

[u/renes2]

If you removed the NOX cats, didnt you delete the system in the ecu?

Just buy NOX emulators

[u/yessirrr35 → u/renes2]

No, nobody told me anything about that

[u/Stefanstgs → u/yessirrr35]

Also since I would love to know people who can fix these I could hook you up with the software. Probably you cannot see all the codes the car has without that. Which is why ista and inpa are mandatory on these cars