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The engine management light means the cars ecu has detected a fault on the engine/emissions/sensors on the engine..normally when fault codes are stored the ecu will go into limp mode hence the reduced power and limited to 30mph..unless you have scan tool yourself? to determine what kind of fault is occuring..you will need to find a garage who has one to see what kind of problem your dealing with and take it from there..unless there is something obvious under the bonnet if you look around the engine itself to ensure nothing has come off plug wise etc..then you will need to have it plugged in to see what fault codes has been logged and then take it from there..once you have the codes then yu can return here with them and i'll try and help..in the meantime as above that's about all you can do from this point on..
Reduced power is limp home mode.. then if its an emissions related fault its showing..you would still need to have it scanned..as you need to determine if its a rich or weak fuel/air ratio issue- fuelling issue - ignition issue - evap fault - lambda sensor issue - or if the cat converter is blocked.. only by looking at the codes and then the live data on those as above would be able to get any frther forward to fixing this...it could be an ignition coil breaking down..i know they can be common for failing on those but you would need to see if it a misfire codes that stored or not..
If its still starting and running..then it should be fine..until as such you can get your garage to look at it..albeit the car being in reduced power mode in the meantime..
Ok..no problem..if you need to ask anything else then just continue on this post..
In the meantime if you could leave a rating/accept for me assisting with your question.it would be much appreciated..thank you