I bought a car 9 days ago which has flashed up an error to do with the gearbox. The dealer says it's just a sensor and wants itinerary for repair but I think it might be a sign of a rather more serious problem down the line and just want to return the car and get a refund. I think the problemwas already thete (it's intermittent) and I would not have bought it if that message had come up on the test drive. Can anyone help?