1999 Lexus RX300 Questions

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I drove to a gas station got gas then it wouldn't start. my Lexus has 125000 miles on it. I recently replaced both knock censors.
What should be the reading of O2S B1S2? The readings I get, at idle, temperature 190*, vary from 0.000 to 0.010 to 0.770. The car while driving sets P0125 code first then later will set P0172. While the car is si...
I had a check engine light come on over a month ago. My scanner said it was a P0171 $10 generic code, bank 1. So I changed the air fuel ratio sensor. The code cleared, then I had a pending code for, I think P1153 i...
Floor, and not responding when brake is applied. Took to break masters and was told it may be electrical issue and have something to do with abs?? But can't pin point and sending me to dealership?? Any ideas??
Started hearing loud noise from rear, growling/humming/?? Sound and vibration that stays constant but will level off once cruising at a set speed, and get louder if and when accelerateing. How can I determine if its ...
Is at the correct level. is there a fairly easy way to rule out possible issues and find the problem for the average car owner. Or does this need to be done in shop setting by cert mechanic?
It is still misfire ing. Check engine light. Comes on and goes off repeats
The weather was cool I turn air condition to hot, after turning back to max cool the air condition does not cool again
has no thumping sounds it runs just fine till i go over 60
I replaced coils in 2, 4, 6 like the man at advanced to me to as the codes read that way.It ran fine for 3-4 months the it started idling real rough an not going into overdrive now the codes pop up to replace 2, 4, 6 ...