I know that I could scan the computer of my 92 Ranger using a volt meter IIRC. Can this be done with the contour? My cel keeps coming on for different thigs and I have almost spent enought to buy a scan tool just by taking it to the shop. Any input on this or should I just buy the scan tool? 
98 SE Sport. custom catback, Intrax springs, 3L, 3L valves, APEXi S-AFC, 24# injectors.
Other cars:
72 Challenger 360 motor 727 trans (used for parts)
73 Challenger 340 motor 727 trans 15.60 1/4 with bad miss and clogged fuel filter.
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