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Author Topic: Oxygen Sensors  (Read 443 times)
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cvharrison
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« on: July 17, 2017, 12:14:35 pm »

I believe my Catalytic Converter has gone bad, and one of the troubleshooting techniques to ensure that's what it is, is to take temperature reading at the intake to the Catalytic Converter and at the outtake.  Should be hotter right behind the converter.  The other thing I was told to check was the voltage readings of the O2 sensors.  The one in front of the Catalytic Converter should fluctuate drastically and the one right behind the converter should be a little more stable.  I know I have two Oxygen sensors on my 2001 Chevrolet S-10.  I can see values being tracked for both coming through in DashCommand but I cannot determine which one is "upstream" of my Catalytic Converter and which one is "downstream" of it.

Would Oxygen Sensor Voltage Bank 1 - Sensor 1 (SAE.O2S11.O2SV V) be the sensor in front of the catalytic converter and Oxygen Sensor Voltage Bank 1 - Sensor 2 (SAE.O2S12.O2SV V) be the sensor right behind the catalytic converter?

Thanks for everyone's help... I'm new, so please be nice :-)
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FlyByMike
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« Reply #1 on: July 17, 2017, 04:26:11 pm »

This pic any help ?
-Mike


* 2011 List of Universal parameters.jpg (192.56 KB, 859x662 - viewed 88 times.)
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Weston@PPE
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« Reply #2 on: July 17, 2017, 05:53:17 pm »

They sensors are usually numbered in the order they appear in the pipe, so sensor 1 is the closest to the engine. Sensor 1 is before the cat, sensor 2 is after it.
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cvharrison
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« Reply #3 on: July 17, 2017, 06:48:08 pm »

Thank you both for your help!
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