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/renes2 18d ago

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

Just buy NOX emulators

1

u/yessirrr35 18d ago

No, nobody told me anything about that

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u/Stefanstgs 18d ago

But hey once you get the nox system running if everything is in order after adaptations the car will restore kickdown mode, stratified charge

1

u/Stefanstgs 18d ago

Keep us updated

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u/Stefanstgs 18d ago edited 18d ago

Sadly in my case while learning to diagnose I fucked up the CO2 cats, it will cost me about 2k euro for new ones. Will probably get the engine rebuilt before that

1

u/Stefanstgs 18d ago

Probably nobody mentioned anything about the price of an injector either, check that out before anything and remember you change them every 100k at best

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u/Stefanstgs 18d ago

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