Where is the diagnostics port on a 1986 Chevrolet P30 in particular Winnebago Chieftain?

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I believe it is inside, under the drivers side of the dash, on the firewall, close to the fuse box.
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Where is the diagnostic port on corsa c?

Center console, above ashtray , you have to look from underneath (you can't see it if you are just sitting in a seat).

Thanks for the feedback!