Are cars and light duty trucks available in Thailand using this ? If so, what year did they start.

Most, if not all vehicles in Thailand have a OBD 2 port.. Can't recall when was it required.. but should not be too far from the US 1996..

Our 9 years old SsangYong Stavic got it, but does not support all features. The Toyota Avanza of 2 years is up-to-date, it works great with a bluetooth adapter from Lazada and my Android phone/tablet. I am used to reading all error codes before I take the car(s) to service, just to make sure.

Current Mazda BT50 and Ranger are compliant, work with the ELM327 Bluetooth adapter and an android tablet / phone.