I never knocked your abilities. However there is no basis for you assumption that these sensors "probably" needed replacing. OEM sensors last for hundreds of thousands of miles without failure. I am simply attempting to help you diagnose the problem with minimal out of pocket costs.

Again, the OBDII diagnostic system is there to aid in technical diagnosis. No one here is going to give you a solution via the Internet without knowing the reason. The reason is there inb your computer - so the most logical step to fix your problem is to grab a code reader of some sort - beg, borrow, or steal, and download the code.

Until then, you can replace all the parts you want without any certainty they will solve the issue at hand.