Check Engine Light on Due to Clogged EGR Passage in Intake Manifold on Mercury Cougar

The Check Engine Light can illuminate with codes due to the lack of EGR (exhaust gas recirculation) flow caused by the intake manifold passage plugging up with carbon and oil. The EGR valve has to be removed and the passage cleaned thoroughly. Partial restriction of this passage can cause Smog test failures for the NOx emissions without causing a drivability symptom.

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Average mileage: 151,267 (122,338–185,000)
Exhaust & Emissions affected: 2.5L V6
5 model years affected: 1994, 1999, 2000, 2001, more2002
12 people reported this problem
3 people shared problem details
2001 Mercury Cougar154,000
Insufficient EGR flow upon diagnostics.
4 people like thisFlag inappropiate
Not enough flow in EGR
1 person likes thisFlag inappropiate
EGR Valve Blown/hole in the valve
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