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.

RepairPal Verified
Average mileage: 151,267 (122,338–185,000)
Exhaust & Emissions affected: 2.5L V6
5 model years affected: 1994, 1999, 2000, 2001, more2002
14 people reported this problem
4 people shared problem details
2001 Mercury Cougar154,000
Insufficient EGR flow upon diagnostics.
Not enough flow in EGR
the egr valve needs replaced
EGR Valve Blown/hole in the valve
Related Items:
The Check Engine Light can illuminate with codes due to the lack of EGR (exhaust gas recirculation) flow caused. This...
If my check engine light is on and keeps reading "O2 sensor circiut malfuction" even after chan...
Just bought used 2000 Mercury Cougar. Had engine light lit, dealer told me it was due to vapor...
I live in new york state and we have inspection every year I fail mine due ,as the mechanice s...

Related Content