saxtonsprays

Hi, I’ve scanned my A3 1.4 petrol 2010 after the engine light coming on. These codes in the picture came up. Since I’ve had an oil change with a full service and had the engine light reset but has come on again. I’ve read about either a camshaft control valve or a high pressure fuel pump, but not sure where I should start. Any advice, or links to what to do would be very grateful.