I got a 2 on the AP Euro exam last year. I had a decent grade in that class (90+). I have received 4s and 5s on all other tests. I’m worried this will sink my chances at a school such as USC or UCLA.
Most schools do not consider AP scores in their admission decisions. Just do not report the 2 on your application.
I agree with @Gumbymom, most schools don’t use AP scores as a factor in admission. Instead, AP scores are used to see whether a student will receive credit for a course or a variety of courses. Don’t report the AP score on your application just to be safe.