Got 'em all in the shop. You make Airtime's point, that being that modern trouble shooting requires more skill and higher cost tools. Yes there are quality "readers" on the OEM level as well as some after market readers that interface with lap tops. The better OEM style equipment runs in the $300 range and up. Codes help you save money and help you use the local Parts Shop's reader as well as their computer for more in depth understanding of that damn amber engine block icon. Yes I have/own one of the cheepie readers @ $300.