Scanning is pretty inexpensive. Maintaining a complex system that passes the scans? That's something different altogether.
If I take a clunker to a mechanic, how much will it cost me to hear everything that needs fixing? About $150. But actually performing the fixes? One order of magnitude greater - and that's if I'm very, very lucky!
If I take a clunker to a mechanic, how much will it cost me to hear everything that needs fixing? About $150. But actually performing the fixes? One order of magnitude greater - and that's if I'm very, very lucky!