Where is the diagnostic terminal on a 1998 toyota avalon?
the OBDII terminal is located on the driver side in the fuseblock panel. There is another diagnostic terminal located on under the the same dash panel just a little further under the dash it is a round terminal looks like something for Toyota to hook their scanner into. Then their is one under the hood about midway back and in the center on top of the engine that is for engine diagnostic . your welcome Jeremy Hadley Arab AL.