Urgent Help Needed.......

hi guys i have a 2002 freelander and coming home tonight my engine malfunction indicator light started to flash and continue to flash, the book told me that the car has an emission problem and to get to a dealer straight away......the car isnt driving correctly and keeps jerking as i accelerate

does anybody know how much it will cost to be repaired?????

and if it can cause any major damage driving it?

regards

ffs - which injun?

sorry 1.8 petrol