Get it plugged into a OBD diagnostic code reader - should give you the error codes which should give you an indication of what needs repairing (or, on modern cars, replacing
)
well rather than paying £50 + for tech 2 im going to use this -
http://www.topbuzz.co.uk/info/fault_codes/fault_codes.htm#simtec56should tell me the information needed and then i can fix it