Oxygen sensors

1996 CHEVROLET S-10
156,000 MILES • 4.3L • AUTOMATIC
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BRUCEDUNCAN
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  • 32 POSTS
I have trouble codes for 2 oxygen sensors Bank 1 sensor 1 and Bank 1 sensor 3. the last time I submitted a question the verification to my e-mail didn't go through. Last year no question verification was needed please go back to the old system. the new verification didn't work.

Please respond if you got this message o.k. E-mail: BruceDuncan2021@gmail.com

Thanks,
Bruce Duncan
Apr 30, 2026 at 11:05 PM
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BRUCEDUNCAN
  • MEMBER
  • 32 POSTS
My o2 sensors one upstream one downstream both have 13.3 to 13.6 volts on the sensor side of the plug with the car running. Both sensors have heater resistance of 3.5 to 4.5 ohms. measured with the plug disconnected. My Chilton manual says 3.5 to 14 ohms is the acceptable range.

Please respond and I will to make sure the computer is working o.k. google chrome is the only browser that works on a lot of websites I use. When you respond I will give you the trouble codes.
Thank you very much guys you guys are great.
Bruce Duncan
Apr 30, 2026 at 11:16 PM