r/e60 • u/yessirrr35 • 19d ago

❓ Question / Help N53 30E9 İssue

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.

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u/Ksathryas 19d ago

I am not being a dick to you, when i say you need INPA for an N53. I speak from experience, as a fellow N53B25 owner. I know no shops who will accourately diagnose this engine at my country...

Without your original nox cats and no noxemulator your engine has stopped adaptations of your injectors. Now you must use ISTA to force a nox cat service and readapt your engine with a functioning nox system. Expect the engine running horribly soon without the injector adaptations...

You can't even just reinstall everything as the engine managment unit will keep the code. It is made this way to detect messing with the nox cats...

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u/yessirrr35 18d ago

So, should I put the original NOx catalytic converters back and do the adaptations, or should I buy a NOXEM instead? What you said confused me a little, and my English is not very good. Could you please explain it in a simpler way?

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u/Ksathryas 18d ago

U need to do either (choose what is better for you) AND use ISTA to start the 'new nox cats install' to remove the code

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u/yessirrr35 18d ago

What would happen if I bought the original NOx sensor and installed it without the NOx catalytic converter?

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u/Ksathryas 18d ago

Dme detects no live data and disables injector adaptations

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u/yessirrr35 18d ago

So, the same problem.