P0422 talks about catalyst efficiency. P0300 is random multiple misfires.
http://www.troublecodes.net/OBD2/Pcodes.shtml
There is nothing to "reset" for the 1999 VW Beetle.
1999 Volkswagen Beetle how to change spark plugs
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( Yes ) the 1999 Volkswagen new beetle is a front wheel drive vehicle
how do you replace the spark plugs on a vw beetle
You have to find out what is causing random misfires in the engine. See related question below.
my 99 vw2.0 L beetle over heat
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5X100
If you mean E85, no.
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