petrol 1.8 freelander engine warning light on 2003 Land Rover Freelander

since my MOT and having some work done on brakes about month ago the engine warning light flashed for a second them went off again this got worse and more frquent I spoke to garage and they looked and said there was a bit of oil on spark plugs and head gasket that they sorted as was leaking a little. the head gasket was changes about 12 months ago. today the warning light came on constantly. I have checked the coolant and oil and they are fine
Any ideas what is could be or what i need to look at next

Asked by for the 2003 Land Rover Freelander
1 answer
If and only if the head gasket is fine, then I would suspect defective ignition plugs and coils. Pretty common really.