P0051 TOYOTA - HO2S 2/1 Heater Ckt Low

Question

Where is the HO2S 2/1 Heater Ckt Low sensor on the 2008 Toyota Axalon slx

Answer 1

Since this code is for the heater in the O2 sensor, the most common repair is the sensor itself. This sensor is the first sensor in the exhaust on the front of the engine facing the radiator. Bank #2, Sensor 1