Check Engine Light Due to a PCV System Vacuum Leak on Lincoln Aviator

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.

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Average mileage: 99,852 (23,000–193,000)
3 model years affected: 2003, 2004, 2005
31 people reported this problem
18 people shared problem details
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.
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.
2003 Lincoln Aviator120,000
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!
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.
I had the same problem which escalated yesterday. It took a while to throw the codes to finally trouble shoot this.
2004 Lincoln Aviator100,400
Error code P0174, "System too lean (bank 2)".
2004 Lincoln Aviator155,000
This situation happens to me and I replace the elbow on the PCV and it fixed the situation.
Just found that problem out today!
Could not keep the vehicle running. Auto Zone informed of air loss in tubing...took to dealership and was informed that the molded plastic PVC tube was broken (air to intake prevented..._ needs to be replaced for $286.00
2004 Lincoln Aviator193,000
Slippage in overdrive
I had to replace the hose, by using a new hose from Autozone.
My car started running really rough, and I think my engine light came on if I remember right. I took it in and they said it was a vacuum leak. I had to replace the hoses. Of course, it ended up being several hundred dollars.
2003 Lincoln Aviator110,000
Collapsed PVC elbow. Replaced it for 7.00 usd. Found at local auto parts store.
engine idles roughly,needed new pcv valve
engine light came on.
Vacuum Leak hose melted made vehicle run bad
Happened today, my truck wasnt driving right the past week and today i was driving to work in the snow, accelerated and the check engine light comes on and now acceleration is very choppy
engine codes indicated lean bank 1 lean bank 2. Both 90 degree elbox rubber hoses from PCV to intack had holes melted in them. Auto supply stores did not have listings for parts, but found suitable replacements by taking hose sections to parts store and replaced.
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