yea i'd check all ur o2 censor wires make sure their in correctly and tight they could have been knocked loose when they were putting on the system disconnect your battery for about 3-5 seconds reconnect it and start your car up. this will reset ur ecu. leave your car running for about 2-5 mins. if the lights comes back on u've got a problem and will need to have your car tested for the engine code. complain to the shop who did the work because your check engine shouldnt come one from i/h/e