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Modified O2 sensor?


k9sar
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Getting the dreaded cat inefficiency code and got to thinking what is really being measured.  I know some people use a spark plug non-fouler but that only would work if the shop doesn't visually inspect the emissions.  Has anyone actually modified the O2 sensor itself to get a 'tweaked' reading?  I've seen videos on adding a resistor in series and a capacitor in parallel but that would be visible too unless it was hidden well.  I was thinking of modifying the tip so not as much exhaust gas gets into the sensor.  Disclaimer... t his is just for a test.  I have ordered new O2 sensors but thought I'd mess around with the old ones to perhaps see what impact I could make on the readings.

enough rambling.... if you've modded your O2 sensor, what did you do to it?  Curious.

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Only modifying ive personally done was the antifouler trick (and actually made spacers out of lug nut lock keys for a friends Escalade that was supposed to be a temporary fix 3 years ago...).  Was always OBD2 stuff that didn't require visual emission check though, as long as the (properly working) engine light was off and was in spec for incomplete monitors=sticker time!

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After modding my Titan with an intake, JWT cams, long tube headers, Cajun catless b-pipes, uprev tuning and such, I used ported o2 spacers from Big Daddy's Garage. Like @nunyasaid, no inspection station I ever brought it to ever did a visual, as long as the obd2 said it was good, it got a sticker. Results may vary in other states though.

 

P.s. I do really miss how much fun that truck was, but don't miss that gas bill!!

Edited by 01Pathmaker
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took the easy and relatively cheap path and threw a pair of rear O2 sensors in it.  Seemed fine but threw the same 420 code again after a couple of days. Checked with my scanner and it says the one HO2S test failed due to a reading of 0023 with a min of 0033 or something like that.  Unfortunately, the damned thing doesn't tell me which sensor it's reading.  Thinking I need to do some testing where I disconnect 1 sensor at a time to determine which is for which test then do some reading on what the fruck the measurements are really telling me.  No way I'm replacing the cat. 

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