My car is a Lexus RX300, year 2001.
I have a check engine light on with a VSC light on. This has happened before with only code PS1135 was showing, this shows in the history. I got that fixed, but I'm wondering how quickly I need to address the current codes? Any thoughts?
Both codes are for bank 1, sensor 1.

 

Welcome, its your personal choice of how quickly you want to fix the problem but expect less than optimal mpg performance until the o2 sensor is addressed.