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I have a C1246 master cylinder code on my 2005 Lexus RX330, what is the cause and what is the repair

Vehicle: 2005 Lexus RX330

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C1246 Master cylinder pressure  sensor.

If you get this code, the only thing you can do and it  might just fix it. replace the stop light switch circuit,and make sure all the brake light work,including the middle brake light,Other than that the master cylinder pressure sensor is connected to the skid control ECU in the actuator ,this is the ABS & Tracton acuator assembly
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C1246 LEXUS Code - Master Cylinder Pressure Sensor Malfunction

Read more: https://www.autocodes.com/c1246_lexus.html

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