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negative long term fuel trims

  • branaae
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3 years 2 months ago #57589 by branaae
negative long term fuel trims was created by branaae
Hello,
I have a 2004 frontier 3.3l supercharged with 2 codes P0132 and P0152 code, (high voltage on both upstream sensors)
My bias voltage is 0 when the engine off key on, should i have a bias voltage? should the engine be on to get a bias voltage?
When i touch the signal wire with one hand while touching 12v with the other hand, i dont see any change in the bias voltage reading in my scanner, but when i do the same with downstream sensors the bias voltage does go up, is this a valid test and if so what does it mean?
Any help would be really appreciated.

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