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I've recently had a check engine light on showing a P0420 ( catalyst system efficiency below threshold bank 1) and a P0133 (O2 sensor circuit slow response bank 1). captured some footage from my OBD2. hoping it is the O2 sensors. they run similar to each other I've noticed. my cat has been running 900 degrees at idle and 1,500 to 1,600 while driving. the car has no hesitation or running rough. I put in bosche but might want to put in OEM, either way is my cat running to high is it time for a new cat? car is a 2017 and is 148k miles on it.




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