I used my edge to check for codes today. Truck is running fine except it is now only getting 10mpg:CRY:. It showed P1451 (Diesel Particulate Filter System Performance) and P0513 (Invalid Skim Key) if you know what they mean please help and are they important? Also does it do anything if you clear them other than make it not show codes? Will they just keep comeing back? Thanks.