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First you buy, borrow, or xxxxx the manual and look-up how to read the codes. Usually it involves using a paperclip or jumper wire to jump 2 terminals on the DLC (data link connector) and turning the key to the on position(not starting it) and then counting the flashes of the check engine light.
This also depends on what OBD connector is under the dash.....some use the 5 and 6 pin (doesnt work but according to haynes is a way to get codes from the OBD2 style found in 1995) some the A-B (OBD1 style) work and work well.
Check compatability with both year and modelof vehicle.
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