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The hole for the 02 sensor?
A spark plug is the same thread if you don't have an old O2 sensor handy.
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Glen
49 Year member of the Porsche Club of America
1985 911 Carrera; 2017 Macan
1986 El Camino with Fuel Injected 350 Crate Engine
My Motto: I will never be too old to have a happy childhood!
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