murphsubaru Posted March 20, 2010 Share Posted March 20, 2010 My 99 Forester is showing code: PO440. This is a vacume leak. Any suggestions what I should check first? What usually causes this?? How do you check a gas cap? Quote Link to comment Share on other sites More sharing options...
lmdew Posted March 20, 2010 Share Posted March 20, 2010 Do a search in this form for the code. Lots of post out there. Quote Link to comment Share on other sites More sharing options...
86subaru Posted March 20, 2010 Share Posted March 20, 2010 make sure the cap is tight aleast 4-5 clicks , if it's a vacuum pop hood listern and look for loose hose ,spray carb cleaner around all vacuum lines and see if it affects anything Quote Link to comment Share on other sites More sharing options...
OB99W Posted March 20, 2010 Share Posted March 20, 2010 My 99 Forester is showing code: PO440. [...] First take a look at http://endwrench.com/images/pdfs/Foresterinfo.pdf If that's not the cause, then a common problem is rust through of the gas tank fuel filler pipe. It can be a rather small hole. If not that, see: http://www.endwrench.com/current/02SpringInsiderInfo.pdf http://endwrench.com/pdf/fuel/MoreP0440TipsInfoW00.pdf Quote Link to comment Share on other sites More sharing options...
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