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If it's any consolation I having the exact same problem.
I went to smog my car and the P0133 code was present (original 02s 104,000 miles). I cleared the code and it stayed off.
I installed headers, and test pipe shortly after passing. I put all brand new 02 sensors in the car. I also put cat simulators on the down stream 02s. I drove the car for 1,000 miles with no issue, then P01333 showed up on the scanner. Cleared it, drove it for 250 miles it came back. And these were Bosch plug and play sensors. I am waiting for my replacement to show up, but if this doesn't fix it a RoW tune will be put in the car.
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