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I have 1135 code

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Hello there i have toyota previa 2001 2.4 engine p1135 code cames up but i have 4 sensors which one i have to change ? Its 2 sensors up and 2 sensors down
Vehicle: Toyota previa 2 4 engine

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P1135 Heater circuit malfunction Bank 1 Sensor 1

All Sensor 1 are the upstream  sensor , Sensor are the downstream 02 sensor

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