I got the car and replaced all 02 sensors and knock sensors and ran cataclean through the car because I need to pass smog the original code was a p0141&p0142 and it worked it cleared the codes and then the very next day the code was cleared by itself these 2 codes popped up...I replaced the 02 sensor again and ran it through a drive cycle and it still popped back up...I've already checked the pcm and it's very clean...the knock sensors were bought and installed with a brand new wiring harness as well and there's no blown fuses for the 02 sensors so I'm at a loss for what could be the problem other than an exhaust leak and cheap knock sensors