None of the above codes show in on Bay 13 or in the Haynes manual. I did some checking and found a reference that said all PO 300 codes refer to an engine misfire, with 302 meaning misfire in cylinder number two. I did change all the plugs, wires, cap and rotor when the car was running poorly a couple of months ago. I disconnected the battery for about 15 mins. thinking that would clear any codes that were stored. Does this actually clear the codes, or do they have to be cleared with a tool.