Car Problem Reports

Lincoln Aviator Check Engine Light Due to PCV Grommet Vacuum Leaks

Lincoln Aviator Problem
29 Reports
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Model Years Affected: 2003, 2004, 2005

Average Mileage: 100,345 mi (23,000 mi - 193,000 mi)


A vacuum leak from the PCV grommet vacuum leak can cause the Check Engine Light to illuminate. The molded rubber hose connections may crack and collapse, causing the vehicle to run roughly. A damaged PCV hose will require replacement.

  • Visitor, , 96,000 mi

    There is a loud hissing sound coming from a hose with a foam like elbow attached to the intake. I can't find parts and its getting called different things like emissions hose, vacuum hose, pcv hose. No one seems to know what it is. It's on the passenger side. My car is hesitating and bogging down when I stop. Check engine light is on. I wish I could post a pic.

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  • OMG!!! you saved me hundreds of dollars, thank you. fire stone did a diagnostic($89.00) and it had more than one bad read. my husband checked this site and the total repair was $7.27 for a small piece of hose.this site is wonderful.

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  •  Rookie

    Yep just replaced this too along with the rack and pinion AND the transmission. Love the vehicle, very disappointed in Ford. It's becoming a very expensive lemon.

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  • Visitor, , 120,000 mi

    I had the same problem with the elbow on this pcv hose. The elbow also collapsed and was very brittle it should be a metal fitting. This website saved me a ton of money thanks to all!

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  • Visitor, , 100,400 mi

    Error code P0174, "System too lean (bank 2)".

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  • Visitor, , 155,000 mi

    This situation happens to me and I replace the elbow on the PCV and it fixed the situation.

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  • Visitor, , 73,000 mi

    I had the same problem which escalated yesterday. It took a while to throw the codes to finally trouble shoot this.

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  • Visitor, , 63,000 mi

    Just found that problem out today!

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  • Visitor, , 193,000 mi

    Slippage in overdrive

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  • I had to replace the hose, by using a new hose from Autozone.

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