Error code: P0137 O2 Circuit Low Voltage (Bank 1 Sensor 2)

Tiny
MLEEPER
  • MEMBER
  • 2012 TOYOTA RAV4
  • V6
  • 2WD
  • AUTOMATIC
  • 79,000 MILES
I'm having a heck of a time finding out if this is upstream or downstream, and where I've had several parts stores give me opposite information. Please help. :-) Thank you.
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Thursday, April 11th, 2019 AT 2:13 PM

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Tiny
SCGRANTURISMO
  • EXPERT
Hello,

This is the downstream O2 sensor. This is how you tell upstream from downstream. The O2 sensor that is closest to the engine is the upstream sensor. Then there will be the catalytic converter going down your vehicle's exhaust from the engine to the tailpipe. The catalytic converter is, I repeat for emphasis, is the "stream" in upstream and downstream, and then the downstream O2 sensor. So closest to engine upstream, farthest from the engine and after the catalytic converter, downstream.

Thanks,
Alex
2CarPros
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Thursday, April 11th, 2019 AT 8:00 PM

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