Get that power probe for less here on Amazon → http://www.amazon.com/gp/product/B00G4YUWMC/ref=as_li_qf_sp_asin_il_tl?ie=UTF8&camp=1789&creative=9325&creativeASIN=B00G4YUWMC&linkCode=as2&tag=httpwwwyou00f-20&linkId=RAPWOQ5W3S3TQQP7
Please watch Mandy's video for a more accurate description of the working relationship of the computer, purge solenoid, pressure sensor, and vent valve in an evap system here → https://www.youtube.com/watch?v=IzfR84T6pBY
P0449 Vent Valve Testing EVAP Systems
