Prius (2004-09) :: Air / Fuel Ratio Sensor Connector Location?
Jun 17, 2012
I am getting code p0420 and want to replace the air/fuel ratio sensor and cannot figure out who to reach and remove the connector to the sensor. How to do it? I read several threads about it and saw instructions for the rear O2 sensor but not the fwd air/fuel ratio sensor.
I hope to remove it from below and avoid removing the inverter. From under the car I can see the cable leaving the sensor and I think I see it terminating in a connector on the left side of the engine. I can barely snake my arm up there and touch it, but I cannot get a good enough grip to press a release button and pull it free.
I got the rear O2 sensor changed in about 45 minutes.
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I have been debugging DTC codes 2237/2238 and what sounds like detonation in a failed catalytic converter in my old 2007 Prius (375,000 miles!), I just removed the wipers and cowl yesterday to look at the air/fuel ratio sensor connection, and my connector appears to be melted somewhat, sides of the connector show signs of melting I am guessing that there is a connection problem stemming from this and the root cause of my DTC codes.
Can the four wires each side be removed so I can get the connector out to look at it carefully?
Can the bad connector be removed and the four wires be simply spliced together to get the air/fuel sensor working again? I did note that the colors of the wires going in are NOT the same as the colors of the wires going out.
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See the attached pics.....
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