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1995 Mercury Mystique

Check Engine Light Due to Plugged EGR Passage

Verified for the Mercury Mystique

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 Reports

fuel injection wiring harness

Reported by jack4243 for the Mercury Mystique

wiring harness insulation has deteriated

1 Report
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