toyota Workshop Repair Guides

Toyota Workshop Service and Repair Manuals

Oxygen Sensor|Diagrams > < Engine Controls - A/F And O2 Sensor Identification|Page 3228
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Oxygen Sensor: Locations

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The main oxygen sensor is mounted in the exhaust manifold upstream of the warm-up three way catalytic convertor. 

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The sub-oxygen sensor is mounted in the exhaust downstream of the warm-up three way catalytic convertor.

Oxygen Sensor|Diagrams > < Engine Controls - A/F And O2 Sensor Identification|Page 3228