[Vwdiesel] K&N

[William J Toensing]

After I installed a K&N air filter on my 2001 Focus, it messed up the mass airflow sensor causing the "check engine" lite to come on. However, I was able to buy a cleaner from our local NAPA auto parts store which solved the problem. I also previously had bought an OBD 2 code reader which after diagnosing the problem enables you to turn off the "check engine lite.
Bill Toensing, Nevada City, CA