If you're talking about the sensor at the front of the engine that's accessed by removing the panel behind the seat, I put my replacement in at snug and it's been fine - no leaks. That was 9 yrs ago.
Have the replacement ready as you'll get a gusher when you remove the old one. Work quickly and you won't lose too much antifreeze.
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GPRPCA Chief Driving Instructor
2008 Boxster S Limited Edition #005
2008 Cayman S Sport - Signal Green
1989 928 S4 5 spd - black
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