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Engine management light after changing exhaust.

  172 cup
hello, since ive had my car its had a performance exhaust on but its really not my thing these days so ive brought and put on a standard system and the engine management light came on when the car warmed up and has been on since. the sensors on the cat/front pipe both were left in place while the exhaust was changed. anybody got any suggestions to get it off etc?? thanks in advance