I have a Vauxhall Zafira 1.6 petrol engine 51 plate. About a month ago the engine management light came on after I travelled about 150 miles, and a trustworthy garage that was recommended to me reset the codes and the light disappeared for a cost of £40. The overall performance of the car has been unaffected by the light coming on. Yesterday the light came on again while driving about 120 miles. The performance again is unaffected but I do not want to pay another £40 out for the problem to come back again in a month's time.

The car was serviced on Friday and it also passed its MOT on Friday. The garage that reset the codes said that it is ok to carry on driving as it is, and that only the emissions are affected. I hope to get the problem sorted in about seven days time and would like to order the EGR valve myself, but I don't know how much the valve should cost.