?light is on but it's because the exhaust actuator sensor was removed prior and wires are just hanging there.. ? are we talking about the servo? Because you might need a servo eliminator.
If not you might want to have a read on this Exhaust Butterfly Valve Actuator Sensor - HELP!!!
If you?re in the UK pm you?re number happy to have a chat.
P.s am hoping it?s not gone past the head valve clearance check.