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po451 problem

cr74
in 1990 to Present Legacy, Impreza, Outback, Forester, Baja, WRX&WrxSTI, SVX

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02 outback h6 3.0 reset the ecm and within 50 miles set a po451 what is the most likely culprit? Pressure sensor or a evap leak? Filler neck and clamps were just replaced. Thanks

Does this one have the filler neck with the two small hoses that run up the side? If those two hoses get switched it will set codes.

  • Author

Dont know, quite possibly. It does have those hoses and someone else did that part of the job. I did the pressure sensor and cleared the codes so lets see what happens. Thanks

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