# O2 sensor fitting to test exhast back pressure

**URL:** <https://forums.speedlife.net/t/o2-sensor-fitting-to-test-exhast-back-pressure/234565>\
**Category:** Classifieds\
**Created:** [January 17, 2014, 9:00am UTC](https://forums.speedlife.net/t/o2-sensor-fitting-to-test-exhast-back-pressure/234565 "2014-01-17T09:00:53Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![drvnkd](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/drvnkd/32/109615_2.png) [@drvnkd](https://forums.speedlife.net/u/drvnkd)\
**Post date:** [January 17, 2014, 9:00am UTC](https://forums.speedlife.net/t/o2-sensor-fitting-to-test-exhast-back-pressure/234565/1 "2014-01-17T09:00:53Z")

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I will be needing to test my exhaust back pressure after I replace the thermostat and temp sensor on my Envoy.  
It has been advised that my cat is probably plugged with crap. I’m sure the 38,000 miles of 2-5 mile commutes does not help 🙂

Sure I could buy a $45 sensor and use the existing one as parts to make my own fitting, but I hate replacing parts that appear to function fine.  
Unless my truck has been running so poorly that the sensor is also shit.

Does anyone have something I can borrow, or know where to buy a cheap fitting to do the job.

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**Author:** ![NYstanger](https://avatars.discourse-cdn.com/v4/letter/n/6a8cbe/32.png) [@NYstanger](https://forums.speedlife.net/u/NYstanger)\
**Post date:** [January 17, 2014, 11:04am UTC](https://forums.speedlife.net/t/o2-sensor-fitting-to-test-exhast-back-pressure/234565/2 "2014-01-17T11:04:58Z")

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So you need just a junk o2 sensor?

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**Author:** ![drvnkd](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/drvnkd/32/109615_2.png) [@drvnkd](https://forums.speedlife.net/u/drvnkd)\
**Post date:** [January 17, 2014, 12:31pm UTC](https://forums.speedlife.net/t/o2-sensor-fitting-to-test-exhast-back-pressure/234565/3 "2014-01-17T12:31:06Z")

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Presumably, that should work so long as I get to keep it 🙂

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**Author:** ![TurboLT1SS](https://avatars.discourse-cdn.com/v4/letter/t/13edae/32.png) [@TurboLT1SS](https://forums.speedlife.net/u/TurboLT1SS)\
**Post date:** [January 17, 2014, 3:58pm UTC](https://forums.speedlife.net/t/o2-sensor-fitting-to-test-exhast-back-pressure/234565/4 "2014-01-17T15:58:02Z")

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Throw an ebay test pipe on it and kill some pandas.