Can I clear faults on my car with an OBD reader?

I have a 2007 Jaguar XKR. When I plug in a reader under the dashboard I see historic and intermittent faults. Can I have these removed by a garage or by myself as when trying to sell the car potential...

Are any of the apps available to turn a smartphone into a car code reader any good?

Are any of the apps available to turn a smartphone into a car code reader any good?

Can you recommend a reasonably priced OBD scanner?

Can you recommend a reasonably priced OBD scanner for a 2012 Suzuki Swift?