Lexus Repair: Codes P0330 and P0446, charcoal canister, toyota service

Question
The check engine light keeps coming on.  I have had work done to it and now I am trying to fix it myself.  It told me to change the gas cap the first reading and now it is these two codes.  P0330 Knock sensor 2 and P0446 EVAP Emission and P0446pd.  Can you please help, I love my 99 RX 300 and I do not want to geta new car right now.  Thanks so much.

Answer
Hello Tami,
 The P0446 is an evap code. There is a campain on this particular year.  Usually the check valve on your charcoal Canister need a replacement. I would have a Lexus trained tech diagnost this problem.  
 On the P0330, What kind of gas were are using? Your knock located in the V-bank.  Sometimes the knock sensor could goes out or connection is lose.  Have a Lexus trained tech look at this problem also.  Thank you.
JP Importz
Dallas Independent Lexus and Toyota
Service, Repair and Performance
www.jpimportz.org
214-221-3135