If you’re taking a car over the pits (rectifying a defect notice - not sure how universal this term is?) you leave a blown tail lamp or something so they have s

If you’re taking a car over the pits (rectifying a defect notice - not sure how universal this term is?) you leave a blown tail lamp or something so they have something easy to find. Then they don’t try too hard and find something expensive that needs rectifying. When you come back they only check the tail lamp noted earlier.