Not a lot has been happening lately. Proudly I can say the S4 has been pretty problem free for some time now. That said, it kind-of feels odd when something isn't wrong.... so, you go looking for something to fix. In that past that can get me trouble so I figure I keep it simple. I put in my K&N Air Filter back when I first got my car, 80k miles or more ago, and I'm sure it likely due for a cleaning. If you have a K&N filter you know it comes in a cherry wood red like color, but mine was more of a charcoal gray.... clearly it needed to be cleaned. Ordered the cleaner and oil kit from Amazon and two days later went to work.....
It appears my driver side EGT (exhaust gas temperature) sensor has gone bad. The passenger side is record the temperature normally and changes as the car warms up and cools down. The driver side get to a set tempature and then just stays there and does not move. The car does have a slight misfire and my thoughts are maybe is this is screwing up the air to fuel ratio. I found on ECS Tuning's site you can get a pair for $299. Next pay check I'll be ordering them.