[DML] Bad Oxygen Sensor / Lambda Sensor

["Steve" <p2freak@xxxxxxxxx>]

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









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