Rite, i have a 05 plate Fiesta ST and about 5 months ago my engine management light poped on so i took the car to the local garage to get the diagnostic machine hooked upto it and it came back as the lamba sensor needed replaced, so few weeks after i got it replaced and got the light put out then after driving the car for about 5 minutes it came back on, so took it back to the garage and the computer says its still the lamba sensor even though i replaced the 1 it sayed with a new 1. Then about 2/3 month ago the car started having problems starting first time when it was hot or been run on a journey, I would try starting it and it would winde over but always started on the 2nd attempt. Then about a month ago the gearbox went so car was off the road for a month and just got fixed last week and when i got it back the light was still on and was still doing the same things, but i took it to the garage as i need the gears adjusted as it wasnt going into 3rd and 4th proper so he sorted it after 5 mins and when i took the car for a test run the management light was off? and its stayed off for a few days and had no problems starting it at all when hot or been teen on a journey. But last night when i was driving about the light poped back on and when i turned the car off then turned it back on it was upto its usual tricks with not starting first time. so if any1 knows what could be causing this please tell as its doing my head in! and would be much appreciated

Thanks