Took to my local mechanic (toyota specialist) and codes come up as p1133 and p1135. He said this makes no sense to him because a 99 4 cylinder camry does not have an AF sensor! Only the V6 has them and they are common to go bad he says on the V6 models. He cleared the light (no charge). The light obviously came back on within a couple of hours. He told me to drop it off and he will try to figure it out. Any ideas as to what it could be??