K&N Filter Causes MAF Sensor Fault Code

[That986]

Originally Posted by DrCactus

I never oiled the K&N filter - I installed it straight out of the box as is... never added any oil to the filter.

Then the oil has to be coming from somewhere else, failing AOS?

And I've never known them be pre-oiled tbh, normally have the oil in the box with it. Then again it's a long time since i used one of those pieces of ****************, Green Cotton filters for a long time now.

[JFP in PA]

Originally Posted by That986

Then the oil has to be coming from somewhere else, failing AOS?

And I've never known them be pre-oiled tbh, normally have the oil in the box with it. Then again it's a long time since i used one of those pieces of ****************, Green Cotton filters for a long time now.

The AOS line enters the intake system behind the throttle body and into the intake.

ALL K&N filters come pre oiled, which can lead to MAF fouling. And while expensive as Hell, they really do not add anything to the car's performance.