P0136 is suppose to be the O2 on the Firewall side. I just replaced it and now have all 3 O2s replaced since the 1st of the year. I drove the car almost all day and it was fine, until it got dark outside and then the CEL came back. Same code. I'm still under warrenty, so it's going in on Thurday. I'll let you know. But I have been driveing on the code for 2 or 3 monthes with the code.
