unc99206

after installing the apr chip, forge bypass valves, and k&n drop in filter my check engine light turned on only once. within an hour of installing the neuspeed cat-back exhaust my check engine light turned on within minutes of driving. it turned off a day or 2 later and turned back on about 5 minutes after it turned off. it hasn't turned off in the past few days. my engine is apparently running lean, and i was wondering if it is the injectors, or Mass air sensor or what it could be?

denic992-- JAYHAWK

get access to a vag-com or go to dealer

Skydive@AI

Sounds like an O2 sensor to me, but you really need to get access to a scan tool.

My2ndS4

A nice bunch of guys!<ul><li><a href="http://www.ncaudi.org">www.ncaudi.org</a></li></ul>