The engine light has been on my Focus for over a year now. I've taken it to two different garages who have told me it's an emissions fault, and a) use high grade fuel, then b) replace the O2 sensor (which they did), then c) repair the ECU. After that final advise I took it to the main dealer who said the ECU needed updating (which they did), and after the light turned on again(!!), they told me it needed a new cat as the o2 sensors were reporting the same reading.

This will cost me £950. I've been advised by another garage to just sell because the car is now at 93k and it won't be too long before the wet belt needs to be changed. Of course with the warning light on I'm getting very low quotes for it (£1.5k). The thing is it drives fine, has passed it's MOT and therefore emissions test during this time (they reset the light during the MOT), and it is only 7 years old. But the warning light remains on.

I use it to commute about 70miles 2-3 times per week, but also use it for family travel. Not ideal having the light on as I can't tell if something else goes wrong. Should I just sell and suck it up? Fix it and hope for the best? Ignore it and see if it goes through the next MOT ok again?