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Q:

emission system light keep coming on after oil change on 1996 Cadillac Seville SLS

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
eimission system
(1) Answer
With out any info you won't get much help. It could be any one of more than a hundred reasons. Get the codes and post them, maybe someone can give you some advice based on the codes.