2000 lexus rx300 has check engin light with codes of 1130 and 1150. what is the problem?
Both codes indicated a failure in the outputs of your air fuel ratio sensors. Because of the fact that both sensors are reporting incorrectly, I would suggest checking your AF relay underhood for failure, or your ground wire on the back of the intake manifold for connection.
Often when these cars have spark plugs changed or valve cover gaskets changed, the ground wire on the back of the intake (which must be removed to perform the mentioned jobs) gets left dangling. With this ground wire not attached, both A/F sensors will report 0voltage, resulting in the two codes you received.
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