This vehicle is in for diagnostics following some warning lights - a familiar story - always uses supermarket fuel and now the sensors are playing up.
Companies like BP and Shell have additives in their fuel which help keep components clean - including sensors. The fuel may be a little more expensive but in the long run it is better for your car.
What should you do if you too have been doing the same. First, buy some fuel additive, a good quality one and add it to your fuel, just poor it in as you would add fuel. Then when you refuel go to a big brand garage.