The 02 sensor should take about one hour to change, unless it is rusted in place. One Boxsters I remove the bumper, wheel and shroud for ease of replacement. I think its a 7/8 o2 wrench. You want to fix this because your cats can clog if you don't have the right fuel mix.
This is a healthy 02 reading
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Mike's Specialty Porsche Service
Mobile Mechanic Specializing in Porsche and Select Automobiles
http://www.mikesspecialtyautomotiveservice.com/index.html
Early 1996 / 97 Boxster, 130 k, De snorkeled, IMS, Top Speed Headers.
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