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P0140 O2 sensor code

20873 Views 7 Replies 4 Participants Last post by  Leyt5
today my truck cut the check engine light on and when i checked it was this code. it says no circuit activity and is detected on bank 1 sensor 2, which one is that? trucks got 4 like what im assuming is normal, before and after on both sides
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The rears don't adjust the air fuel, the fronts do that. They are only for emissions. So you should be fine for a while.

I had that code recently it turned out to be the wires had been pinched off on on the frame. Resoldered the connections and now I'm fine.

I would physically look at the sensor before replacing it. Mine was a denso. Prob want to put the same sensor back in. I Just slid under the truck and looked no need to jack it up.

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