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Not a lot of people have the tool that allows you to do this, the PIWIS costs a few thousand dollars. I would suggest posting on RennTech, I think a few of the members over there have them.
You could also try taking your car to the dealer and politely ask them to turn on the outside temperature (which is the OBC). It might work better if you took it in for an oil change, since they will already have your car in the service bay.
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1999 Ocean Blue Metallic Boxster - blueboxster.com
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