2005 Nissan Sentra Logo
Anonymous
Anonymous Posted on Jul 13, 2011
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I just bought a used 2005 Nissan Sentra from a local dealer. It was running OK but within one week the "Service Engine Soon" light came up and has been on so far. Autozone read out two codes: P0455 "Evaporative Emission Leak" and P1446 "Vent Control Valve". Asked the dealer and their mechanic says it might be improper starting, bad gas, or bad gas cap, but I suspect there's something wrong with the vent control valve instead. Anyone got experience with these errors? The car is still running but I'm afraid it might suddenly go wrong some day.

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Azrael SRL

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  • Nissan Master 11,800 Answers
  • Posted on Jul 13, 2011
Azrael SRL
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Yes, the defect is clearly in the valve: as the error says it's non responsive and stuck partially open. It's not a big problem, the engine will just run a little rough and use more fuel.
To fix that just replace the valve and check all the pipes.

  • Anonymous Jul 14, 2011

    Thanks. What I'm confused about is the two codes showing up together. If the only problem is the vent control valve, according to the service manual it seems P0455 indicates the valve is stuck open while P1446 means it's stuck closed. So you mean if the valve is stuck partially open the two codes will both come up?

  • Azrael SRL Jul 14, 2011

    Actually the second error code says that the ECM can't control the valve, whatever the position is stuck on - in your case partially open.

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