Nakedhoof

My wife's A4 just had to have the throttle body cleaned out, and the oxygen sensors replaced on both sides, because of a K&N filter oil muck up. K&N filters were probably a good idea when engines would just suck that stuff up, and burn it inside the cylinders, but not with today's modern intakes. Not a good idea.

End result: Just under $1100 at my local indy shop. Probably would have been $1500 at the dealer.

TH3PERFECTON3

I just put K N Filter Nobody seam to mention about that problem. What symptoms did your wife car had. How many miles on the filter

engleg

I've also heard in the past that excessive oil from a K&N filter can also damage the MAF sensor (not cheap).
Make sure you only add a minimum amount of K&N filter oil after cleaning the filter.

KevinGary

K & N have been a known problem for a long time. Stay away.

uberwgn

Yeah, oil migration comes with the territory with that design.

rrwood

+1

bpd

This is K&N's argument. Videos added also.

https://www.knfilters.com/MAF/massair.htm

CHIO

I have been running KN filters in my street cars and race cars and have never had an issue with any of them!

lmariorod

I've kept the dirty OEM filter, so that when I clean and oil my K&N, I place back the OEM filter while the K&N dries thoroughly and the oil settles. Never an issue.

Nakedhoof

I called my mechanic because I remember seeing someone else mention this in another thread. I asked him if that might be the problem, and he said it was possible. He confirmed it when we picked the car up yesterday. I told him to replace that filter with the stock filter. My wife told me that throttle response was greatly improved after the work was done.

The symptom was a CEL. Maybe 40k on the filter.

Another +1 for Village Import in Clifton.