Lexus Troubleshooting Questions? Ask a Lexus Expert
Did you change Bank 1 Sensor 1 after the P1133 Code appeared?
And after the replacement now you are getting the three codes?
Want as the brand of the sensor installed on bank 1?
I would think that the P1354 may be causing the others two to set event though P1354 relates to Bank 2 OCV and P1133 is for Bank1 a/f sensor.
Also when was the timing belt last replaced?
OK Denso Sensor is good so you you probably will not have any issue with that.
So the fact that you replaced Bank 1 Sensor 1, and still got a P1133 is a little odd but, it is not impossible that the OCV on bank 2 is not causing this.
Since you already purchased the OCV I would recommend replacing it before proceeding any further, as this may be your root cause to all the codes.
When changing the OCV check for any debris that may be stuck in it( also check for any sludge build up, this is also a common cause of OCV problems on the older RX's).
Just following up with you, I wanted to see if the OCV solved your issue? If you still need assistance please respond here.