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

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: 152,597 (80,000–269,000)
7 model years affected: 1998, 1999, 2000, 2001, more2002, 2003, 2005
15 people reported this problem
1 person shared problem details
Check engine light illuminates and flashes Loss of power when check engine light flashes Changed gas line vaccume hose today Still check engine light flashes and I lose power
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