Sorry, I'm a little confused by your reply. Not sure what the Three-Way Converter (TWC) is. Also not sure what F23A4 means, could you please go a little bit more into details about what all this means. Also, I don't have a scan tool, I went to autozone for the reading. Should I buy one and have it plugged in while I drive?? I'm a little confused. Thanks for your quick response and all your help.