Found this info on a website: There are 7 #s on top of the map sensor connector(on the sensor it self).The first series of three tell you how many bars it will read.1 bar #'s 039,460,883. 2bar #'s 886,012,539,609. 3 bar # 749. Also if you disconnect the map sensor and look at the male connector and the weather proof gromet is green,it's a 1bar.The 2&3 bar have a black grommet.