Vectra 2.2i - eng mang light came on. I checked it with meter and cleared it- I have been doing this for a few months - every 1/2 days the light comes on again. Took to the dealer they diagnosed stock swirl flap - £400 + another £200 to fit them. That was a week ago - the eng mang light has not come on since. Should I proceed with the suggested repair. The car runs fine even with the light on and does not lack power - 41K on the clock. Any advice would be welcome.