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Old 01-09-2014, 06:01 PM #1
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2002 4runner o2 sensor output voltage
Hey everyone! Just wondering if somebody knows what the specs are for the output voltage of both o2 sensors. Im just trying to check that everythings working fine on my newly acquired T4R.
So I was playing around with my OBDII and looked at the readings. Its just I've heard that the output voltage should not go above 1.0.

O2 Sensor 1 - 3.25v
O2 Sensor 2 - 0.5v

Checked this at idling 690rpm.
I did not get an MIL by the way.
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Old 01-09-2014, 08:50 PM #2
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Sensor 1 is actually an Air/Fuel Ratio sensor so a 3 volt signal isn't unusual.
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Old 01-09-2014, 08:55 PM #3
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To check the O2 sensor you need a scope. But from your readings I'm guessing you have a 2001-2002. These trucks have a A/F sensor for bank 1 sensor 1 and a regular O2 sensor for bank 1 sensor 2. The A/F sensor range is 2.8-3.8v and the O2 voltage range is 0-1v but they are waves and a meter will average it. You have confirmed that its functioning and with no CEL its probably fine. If you had a scope you could see the shape of the waves and that could tell you if you had a bad quality or a malfunctioning A/F sensor or O2.
Hope that helps
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Old 01-09-2014, 08:57 PM #4
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Old 01-10-2014, 12:56 AM #5
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Thanks guys! Glad to know everythings good with those two)))
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