Finally did it.. I used a propane torch to heat the sensor for a good 3-4 min.. then put water on it.. then use a pair of vise grip and start hammer it.. it came off. then i used a runner to clean out
the threat.. The new sensor screwed in smoothly...now the rough idle is gone..

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Tony S....
98 MB E320
85 MB 380SL
01 Subraru Impreza (sold)
04 Toyota Highlander
82 25' W/A Cruisers