@RoryAlsop no they don't. And newer cars are all computer controlled which whilst great when it works... Is expensive when it goes wrong
Our focus is 05 so still computery but at the same time has a lot of mechanical parts still so, you can fix an amount yourself
My dad used to fix up cars with his brother and my late grampy... They'd sit around eating beans for a few days so they had enough spare metal to just hammer into shape and rivet or weld on lol... Good old times.
They reckon to fix the sensor, if the gearbox needs replacing will be 600 just for the parts... And with the door and now a new battery we're looking at about a grand including labour...