Engine management system has recently started to show orange engine sign followed by gearbox fault intermittedly .car seems to be wavering very slightly in stearing.2001S type v6 auto petrol ,was told when purchased 3 years ago ,the battery was new ,but have had slight problems with it .so looks to be faulty,the mileage-64,000bought the car with my heart and not my head.any ideas what the problem is and what my next move should be? bob