So after owning a MB E-class and a Jaguar XK-8 convertible, I decided to get a S4 convertible. I saw a 2005 S4 Convertible.

· Model year 2005
· Production date late July 2004
· In service date Dec 2004
· Engine code BHF
· Transmission code HHU
· Model S4 Conv.quat.4.2 V825
· Sales model 8H754L

Audi Certified Pre-Owned warranty. Had 20500 miles on the car. So I traded my Jag for it. That was little over a week ago.

After about 200 miles, I get the Check engine light. Took it back to the dealer and the service tech connected the OBT reader and mumbled something about sporadic misfires. They reset it and told me to see if it happens again.

So the light would come on solid. Now, when I start it cold, the CEL would flash for about 15 to 20 seconds before going solid. The car would also really shake and I can feel every misfire. Even when it is warmed up, the car idles rough. Also, it acts like it just lost 100 hp. So I dropped it off at the dealer on Sat. I am waiting for a call on Monday to see what the issue is.

Now, from my experience with other German and English cars, this means – plugs, plug wiring, coils, o2 sensors, etc. Mostly emission stuff or need a tune up really bad.

So, any ideas? Real bummer that this happened after only having the car for a week. Good thing for the warranty but still hate to have the car at the dealer.

david

2005 S4 Trip Conv, Black

 

Yes, coils are a big one, this sounds more like a 200,000 mi car then a 20k mi car. deffinatly get that sorted out at the dealer while you can? how long is the warentee?

 

Chances are it's plug/coil related.
It will cause all that you describe.

 

I have until Dec 2008 for the Standard Warrenty and the CPO goes to Dec of 2010 (up to 100,000 miles). So I better take advantage of the Audi Warrenty ;-}.

Let's see what the dealer says the issue is. I am thinking of getting my own Diag tool to read the codes. Any recommendations? Also, I'm in the Chicago area so if someone has one, i'll like to see it in action before ordering.

david

 

Vag-Com it's the only tool for Audi.
http://www.ross-tech.com/

 

I will check out Vag-com.

I just got my car back from the dealer. It was the coil for #5. How often do these need to be replaced? The car is only 2 years old and 20K miles.

david

 

glad you have your car back!
i haven't had any real issues with mine. just took it in today for the 25K check up.
hopefully you'll roll smooth from here on out!!
post some pics.

 

Will post pictures when the weather in Chicago clears up.

david

 

i work at a audi vw only shop in seattle wa. coils and plugs are a huge failure part on audi and vw. i am new to the site but see alot of worth while info here. u guys are very good at problem description. and yes vagcom is the only good tool for audi and vw just short of the dealer tool. and also u can buy the adapter to program ur own keys as well for about 500 bucks

 

wow. 5 years and resurrected..

anywho.. welcome to the site!!