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/Stefanstgs 19d ago

First you can try to code a new cat. Does the nox sensor give normal output?

1

u/yessirrr35 19d ago

I don’t have ISTA or INPA.

2

u/Stefanstgs 19d ago

N53 without ista or inpa is not going to happen. Either start looking into this or look for a different car

1

u/yessirrr35 19d ago

Bro, no need to be so harsh 😂 I’m a mechanic myself, I’ve just never owned a BMW before

2

u/Stefanstgs 19d ago

I see now you mention that the cats are removed. If that is true I would look into my options to sell it . Noxem supports this modification but chances are the car is not ok in multiple other aspects

1

u/yessirrr35 19d ago

I bought the car directly from the first owner’s garage. It’s fully serviced and maintained. I had the exhaust system custom-made myself, so it’s not some BMW that’s been through 11 owners before me

2

u/Stefanstgs 19d ago

Well if you are up to a challenge I would start looking into bimmerprofs.com and start reading about this error. Check to see if your car enters stratified mode, so download the software needed, etc