99 Contour Smog

All,
    A friend of mine has a 99 contour. He can't pass smog because the smog machine can't bring up the history or read any of the sensors. Is
this a computer problem? Any Ideas?
Thanks,
Rick
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Sounds like the data link is down.. BUT: Suggest he take it to a parts store that reads out codes for free and see if they can read it.
If so, then he has a claim that it's not his problem to fix.
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