I am looking into picking up an inexpensive OBDII unit and I've gotten information overload to a point that I am looking at too much conflicting info... I have a 2000 C70 Convertible, OBD II port. what is the protocol I need to be sure the unit can decipher? I like a cheap U380, 30 bucks, here is the info: a.. SAE J1850 PWM b.. SAE J1850 VPW c.. ISO 9141-2 d.. ISO 14230 (KWP2000) I 'thought' this car was ISO 9141 compliant... ?? Help!