Check Engine Light Due to Plugged EGR Passage on Mercury Cougar
Problem overview
The Check Engine Light can illuminate with codes due to the lack of EGR (exhaust gas recirculation) flow caused. This is commonly a result of a clogged passage in the intake manifold. To correct this problem, 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.
6 people reported this problem
2 commentsMercury Cougar vehicles with this problem
2 model years affected
Average mileage: 118,000 miles
(101,000 - 135,000)
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