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P1135 code Bank 1 Sensor 1. Is it easy to change and where exactly is the sensor located?

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P1135 code Bank 1 Sensor 1. Is it easy to change and where exactly is the sensor located?
The DTC reads A/F Sensor Heater Circuit Malfunction Bank 1 Sensor 1

Vehicle: 2002 Toyota Highlander 3.0L V6

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Bank 1 Sensor 1 will be behind the engine by the firewall and it will be the first sensor. See picture below

Toyota Highlander Oxygen Sensor Location

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P1135 TOYOTA Code - Air/Fuel Ratio Sensor Heater Circuit Malfunction Bank 1 Sensor 1

Read more: https://www.autocodes.com/p1135_toyota.html

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