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Engine warning light after exhaust change.

  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​
  172 cup
update. i have just started the car and the rectangle light with the spiral running through and also i think its the injector light (yellow squareish shape bottom right on console) were both on and the car would not rev and was sat at 2k rpm, restarted it and it started as normal able to rev but the injector light stayed on?? thanks