Group, Uploaded a picture on my server and want to pick your brain on this one. This is the old oxygen sensor I removed. It has about 3500 miles on it and installed during 2001. The black carbon soot is severe. Is there any service life left in this sensor? Looks like the fuel mixture is rich. Symptons: rough idle at cold start up. 1000 RPM with surges to 1500 RPM. After the engine warmed up, idle drops back down to around 800 RPM. A new sensor didn't solve the idle problem. Here is the link: http://www.aufetechnik.com/IMG_0180.jpg. Thanks. Steve VIN#04421 To address comments privately to the moderating team, please address: moderators@xxxxxxxxxxx For more info on the list, tech articles, cars for sale see www.dmcnews.com To search the archives or view files, log in at http://groups.yahoo.com/group/dmcnews Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/dmcnews/ <*> To unsubscribe from this group, send an email to: dmcnews-unsubscribe@xxxxxxxxxxxxxxx <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/