turn key on into accessory
stomp on the gas pedal 5 times
and the Check Engine light on the cluster comes on, and flashes, the number of blinks it makes is equivalent to a number. it read out fault codes, if there are any.
its pretty cool...helped my dumbass out after cutting of my diagnostics port -_-
***E30 part out to come. Gimme a PM for any inquiries!***