Could anyone please help me with the solution to correcting A2 error codes 2-3-2 and 4-1-4? Can reset (hear something make an electric motor-like, whirring sound when I do reset) and drive a bit w/o check engine light being on, but codes set again by end of day. This trouble was preceeded by blown thermostat that I didn't get around to changing for about a week. Could I have possibly screwed up O2 sensors? Would appreciate any suggestions. Thanks.