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05-18-2014, 09:58 AM | #1 |
Drives: 4 Door Join Date: May 2014
Location: Statesville, NC
Posts: 11
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Up stream o2 Oxygen sensor above 3 volts?
I test and replace o2 sensor before on other cars but this time with my Yaris I have a very bizarre situation. While the car is fully warm in operation temperature According to my multimeter, it show's little above 3.00 volts and it doesn't fluctuate from 0 volt to 3.00..."a steady voltage" I try to give it some gas but it still doesn't fluctuate. What's very strange is that the instrument cluster does NOT throw any trouble code and even thou I stick in a diagnostic scan tool it doesn't show any trouble code and emission status are good. Not to mention MY GAS MILEAGE WENT GARBAGE!!! I never heard 3 volts before on a o2 sensor. Maybe Toyota did some thing different from other car manufactures or maybe I have a bad o2 or a short some where?
Also the down stream o2 sensor read 0 volts at idle. |
05-18-2014, 10:42 AM | #2 | |
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Drives: 09 5dr LB, 2x 08 3dr LB Join Date: Oct 2008
Location: USA, CT
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Quote:
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05-18-2014, 01:37 PM | #3 |
Drives: 4 Door Join Date: May 2014
Location: Statesville, NC
Posts: 11
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05-19-2014, 09:33 PM | #4 |
Drives: 4 Door Join Date: May 2014
Location: Statesville, NC
Posts: 11
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i notice its not a o2 narrowband sensor. its actually an air/fuel wideband sensor. im surprise.
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05-19-2014, 09:47 PM | #5 |
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Drives: 09 5dr LB, 2x 08 3dr LB Join Date: Oct 2008
Location: USA, CT
Posts: 13,460
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Correct. The downstream one is a normal 02 sensor, but it too is operated in a current control mode.
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05-19-2014, 09:53 PM | #6 |
Drives: 4 Door Join Date: May 2014
Location: Statesville, NC
Posts: 11
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12-16-2017, 02:39 AM | #7 | |
Drives: Sedan Yaris 2010 Join Date: Dec 2017
Location: Nigeria
Posts: 54
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Quote:
Thanks |
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