i want to buy an OBD II code reader. i am looking on ebay and seeing wide variety ranging in price from 30-450...i see that some of the more expensive ones have different color connectors for different makes of cars and some of the more cheaper ones have just one connector.why is that?? i was reading that the one connector should be compatible with all 96 and newer vehicles because they have the 16 pin connector. i hav the haynes repair book for my car that list all the codes that would come up on the reader so could i buy a cheaper one that would just tell me the code?? if anyone has any GOOD advice. let me know. thanks