So now im more concerned since this code popped up only after i did the timing belt.The front O2 switches back, and forth between rich, and lean. rich/lean/rich/lean/etc... If the cat is doing it's job, it will be "cleaning" the exhaust, and the rear O2 will barely switch. If they both switch insync with each other, it's because the cat isn't "cleaning" the exhaust.
For the Scan tool tests shown in the video, you can use the Torque app instead. Good scan tools with (fast data sample rate) O-scope functionality are always better than the slow ELM327/Torque crap that you and I use.