You'll need the radio code to do this. When you reconnect the battery the radio will display the word 'code' when switched on. The code should have been recorded in the vehicle handbook by the...
its easy open the bonnet find the location of your battery usually on the top right corner. Get a 10 spanner loosen the nuts holding the terminals remove the positive(red) and then the negative make...
The engine managment light can come on for any number of reasons some people say take it to a garage but there is a way to find out yourself by doing an online search for information.