I have a 2000 T4R with the check eng light on, code PNL? What does this code mean? It needs to be smoged in CA and they will not do it with the check eng light on. I have taken it to several mech's and all said it needed something different ranging from replacing all 4 co2 sensors to replacing the cad converter priced from $1200 to $3800. It runs great, no other problems. Did all the things suggested in this form, didn't help. Please help. P.S. I am female, hope that's not part of the problem. Thanks