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I had occasional P0134 code come up on my car (bank 1 sensor 1 no activity detected). I checked the sensor output using OBD2 and as soon as I started driving around 100kmh the output was dropping to 0v. It would usually recover when I stop for a minute or two. I replaced the sensor and I'm still getting the same issue. I did another test where I unplugged the sensor from the PCM and fed it with a ground directly from the battery - same issue, output dropped to 0v at high speed.

What would be the next step? I understand that oxygen sensor should be producing voltage between 0.1 - 0.9 - in case of any manifold leak is it even possible that the sensor would be producing 0.0 instead 0.1? Not sure if I should look for leaks or replace the sensor again (this time with a genuine part..)

Thanks in advance!

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  • 1
    Sounds like an intermittent short in the wiring to me.
    – GdD
    Sep 4 '20 at 15:25
  • Super lean condition will cause this issue.
    – Moab
    Sep 4 '20 at 16:13

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