[StoneCold]

Brought her in for battery connector recalls & dealer did a quick inspections & informed me that I have an engine leaks due to a seal broke & oil get into eccentric sensor, appro $1300 for the job.

She runs fine& no codes found. Should I be worry or just wait until it shows code. She is at 80k miles. Thanks guys.

[fun2drive]

I am fairly familar with the 335 engine and I guess I don't know what an essentic sensor is. I would ask them where it is located and what it does. This sounds very strange to me.
Before I would authorize any work I would get the diagnosis then research to see if it is critical, if they are the best place to do the work as well...

[luckydawg003]

It's really labor intensive. There is a DIY somewhere. I replaced the valve cover gasket in my 07 328i. The eccentric shaft sensor is under the valve cover.

[dassub]

I had no codes when my eccentric shaft sensor crapped out. Made the car impossible to start.. took a LOT of attempts to start the car. Dealer told me it was hard to get it started when I dropped it off, too!

This was over a period of about a week.. just got progressively harder to start until I got frustrated and brought it in.

Approx $1500 out of warranty.

[StoneCold]

Eccentric shalf sensor itself cost $425, they needed to remove valve cover gasket due to it locates under that & near by a timming chain.

Again, she runs just fine & no problem
Of starting & driving her either & very weird?

Anyhow, I will monitor it to see what' up before having a surgery on her!

Thanks for your inputs guys & appreciated it a lot.

[MrQuickR1]

This is where it is located
http://www.e90post.com/forums/showthread.php?t=697252

[Juiced46]

Originally Posted by fun2drive

I am fairly familar with the 335 engine and I guess I don't know what an essentic sensor is. I would ask them where it is located and what it does. This sounds very strange to me.
Before I would authorize any work I would get the diagnosis then research to see if it is critical, if they are the best place to do the work as well...

N54 335 does not have valvetronic, therefore it does not have an eccentric shaft sensor.

The sensor will sometimes leak oil through it, if it gets real bad it will push the oil through the harness. It can become a problem over time depending how bad the leak is. Usually you will have some driveabilty issues and/or CEL. It may be fine now, but overtime it will get worse. They are not BSing you.

[fun2drive]

Ah I see where it sits now right in the upper tensioner path. What a PITA to remove all that crap to replace a simple sensor. Can I assume the function is to verify the VANOS is in the correct position?

I learned something I didn't even know the 328 had this...

[Juiced46]

Originally Posted by fun2drive

Ah I see where it sits now right in the upper tensioner path. What a PITA to remove all that crap to replace a simple sensor. Can I assume the function is to verify the VANOS is in the correct position?

I learned something I didn't even know the 328 had this...

It monitors the position of the eccentric shaft, not the VANOS