Hi there,
Since replacing the sensor hasn't solved the issue, it's likely a wiring problem. Here is some more info for you.
P2112 LEXUS - Throttle Actuator Control System - Stuck Closed Read more: https://www.autocodes.com/p2112_lexus.html
P2138 LEXUS - Throttle Pedal Position Sensor/Switch 'D'/'E' Voltage Correlation Read more: https://www.autocodes.com/p2138_lexus.html
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