why won't my 4wheel light go off? suddenly 3 lights come on for some reason. on 2009 Toyota RAV4

the engine light came on and the 4 wheel light and the swerve light. They won't go off. What do I do? I can't afford much at all and haven't had the truck but about 6 mos. HELP!

Asked by for the 2009 Toyota RAV4
I had a similar problem. One of the oxygen sensors had gone bad. It was fairly expensive to repair (approx $600) but I went to the dealer. Hope you've had it fixed by now!