my truck did not pass the smog test because of emissions on 1997 Ford F-150

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
i try to read the codes but there was no codes for emissions what could be the problem truck is 1997 v6 ford f.150 pick up
(1) Answer
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need eng codes or exh readings from test, post so we can adv
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