You need an OBD-II scanner, that plugs into the outlet underneath teh steering wheel, and it will come with a list of codes.
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"The CEG Nazi" www.contour.org
1996 Ford Contour SE - Sold
3.0L V6 and Arizona Dyno Chip Turbo Kit
364 whp, 410 wtq @ 16 psi and only 4,700 rpms.
1999 Tropic Green SVT Contour - Bone stock and MINT