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Have any of you seen and O2 sensor do this ? Forums > > Have any of you seen and O2 sensor do this ? Have any of you seen and O2 sensor do this ?
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Frontier Nissan Frontier/HB/Truck Discussion Forum

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Old 05-23-2021, 10:11 PM
Roadrunner76 Roadrunner76 is offline
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2016 Frontier King Cab
 
Join Date: May 2021
Posts: 4
Default Have any of you seen and O2 sensor do this ?

2016 Frontier 2.5L throwing me a PO420 randomly. 63k milies.

I am troubleshooting with a scanner and also learning as well.

My Issue : While watching the live data chart of my DOWNSTREAM O2 sensor. B1S2

Idle voltage is STABLE at .57volts at 700 rpm

When I rev up to 2000 rpm,,,,,the O2 voltage DROPS to about .15 volts and comes
back up to .57volts ,,IN A "U" shape. Even though the RPMs are held at 2000.

I was thinking a Lazy O2 sensor or perhaps the Cat cannot absorb the amount of oxygen
flowing into it at the rate during acceleration to 2k and thus, the oxygen just passes through,
showing a lean exhaust to the o2 sensor ( would indicate a bad cat).

Any of you folks ever see this U type response ???? in the Downstream O2 ?

Im hoping that the Nissan dealer will replace the cat for free under the Fed Emissions 80k mile
warranty BUT my state of michigan does not require smog testing, so I may not be eligible for
the fed warranty, not sure but any input from you folks is appreciated.
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