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Where is the sensor is Bank 1 Sensor 1 on 2007 Toyota Sienna? I have the engine code P0031

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Where is the sensor is Bank 1 Sensor 1 on 2007 Toyota Sienna? I have the engine code P0031

Vehicle: 2007 Toyota Sienna

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Bank 1 is the bank closest to the firewall, sensor 1 will be in the exhaust manifold or the pipe BEFORE the catalytic converter.
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P0031 TOYOTA - Oxygen Sensor Heater Control Circuit Low Bank 1 Sensor 1
Read more: https://www.autocodes.com/p0031_toyota.html

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