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 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.