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Error Code 55 On Air Con Screen.

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Hi fellas. Strange fault with my 2013 IS300h. On start up the air con buttons are dead other than Auto and nothing works. After 30 seconds it all comes to life and all buttons function normally, but the heater switches on at 24°. Adjustment and indications then work fine. A self test of the system gives code 55, which apparently, is heater resistor bank 1, sensor 3.

Does anybody have any idea where this sensor is and if it can be renewed if need be? 

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