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Upper O2 sensor vs Air/Fuel Ratio Sensor

Discussion in 'Gen 2 Prius Care, Maintenance and Troubleshooting' started by Crain, Feb 28, 2016.

Crain Junior Member

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I was reading the o2 thread and ... are these two different names for the same part? Toyota only list an Upper O2 sensor when I search for Air/Fuel Ratio Sensor no hits.
Thanks Don.

#1 Crain, Feb 28, 2016
Patrick Wong DIY Enthusiast

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The correct name is air/fuel ratio sensor, but the parts catalog probably has generic descriptions. That sensor is located in an "upper" position with respect to the catalytic converter.

#2 Patrick Wong, Feb 28, 2016

Crain Junior Member

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FWIW Toyota parts search calls it the Upper O2 sensor.

#3 Crain, Feb 29, 2016

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