How do you read codes off s4 fc's i know you need a tester and you read them off the green testing plug, but where can i get the tester or can i make one? whats the deal? and how do i know i have codes? are the fc's obd1? somebody set me straight https://www.nopistons.com/forums/pub...#>/biggrin.png

You can make a tester real cheap, also helps when you need to set your TPS. http://www.idahorotary.com/86_88ecu.htm

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