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O2 Sensor Voltage

1915 Views 4 Replies 3 Participants Last post by  Undrstm8ed
I've been struggling with various CEL codes since I bought my 2004 Xterra 3.3l. Lately they have been converter/O2 codes.

I replaced the passenger side (bank 1) sensors up and downstream. I bought the cheap Kwiksen ones off of Amazon. The upstream sensor seemed to still have problems so I replaced it with a Bosch sensor. That seemed to help. And after that I also found a vacuum hose that was disconnected and since the the car has run much better.

However today I got a P0037 code (bank 1, downstream...Kwiksen sensor) and while waiting in line at the car wash I noticed that my temp was at 219 degrees! I'm not sure if the two could be related or not. I replaced the thermostat, water pump, hoses and coolant just a few months ago. And the fan seems to be working. I'm not sure what that was about.

Attached is a snapshot of the 02 sensor voltage. What does this say? To me it looks like the Kwiksen sensor (bank 1 sensor 2) is bad. But bank 2 doesn't look right either. Bank 2 almost looks like a bad converter.

Any thoughts??

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How many miles are on the converters? Are they original?

2002 XE 18" Street tires Curt Class 2 hitch Curt luggage basket Sent from my XT1254 using Tapatalk
The truck has 110,000 miles and as far as I know the cats are original.
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