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Discussion Starter #1
My Santa Fe has developed an issue with the downstream O2 sensors.
after starting and idling, I can see the voltages drop to 0 Volts. it doesn't stay there. it goes between normal operation and 0 volts. eventually it causes 2 codes P0157 and P0137 for low voltage. there's no shaking like from driving that would lead me to believe there's a loose wire or bad connection.

is it worth it to just replace them, or should I dig further to figure out why it's happening? there's only around 80,000 miles on the car.
 

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Drives : Nissan NV200 Flies : Rans S6ES
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Seems odd that both sensor are displaying the same incorrect voltage output. What are the chances both sensors would fail in the same way at the same time? That doesn't seem very likely to me.

Have you had a look at the fuel trim values?
Noticed any engine performance issues?
 

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Discussion Starter #3
Nothing weird in the performance.
The fule trims pegged in freeze frame when the code was set, but they are normal when it's not happening.
and both sensors don't do it at the exact same time. they just do it on occasion.
I need to get under there and see if anything looks bad or corroded.
I was thinking a grounding issue, but i would figure if that was the culprit, they would both go down at the same exact time.
 
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