lads, I'll hold my hand up and admit I know little to nothing about cars, looking for a bit of advice. a light started showing on the dash of my car last week so I booked it in for a check and it was due a service so I got that done too. paid a decent amount of money to solve all the issues they found and had it back less than a week and 2 different lights started flashing on the dash so I brought it straight back out. waited about a half hour and they ran a diagnostic on the car and they said it was good to go, 2 minor issues that they resolved. I was only 5 mins down the road and one of the lights started flashing again, brought it straight back. they're telling me now it's going to cost another few hundred to get a new issue that they've found sorted. is that normal, surely that should've showed up in the service they did last week?