MY RX 300 2003 engine light with vsc on 2003 Lexus RX300

I replaced o2 sensor one year they said rear side sensor gone and 2 sensor will cost $500.00,also i have to change my engine pipe which cost 300 bucks. Is it real price?

Asked by for the 2003 Lexus RX300
you did not tell us the full story. sometimes, you can't remove the old oxygen sensor (age, rust, moon phases) and
the pipe that it screws into has to be replaced. if this is what happened, they are correct.
Other mechanic said after diagnosis Bank#1 sensor # 1 I have to replace which cost $300
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do you mean the front engine connector pipe with the flex joint?