Check Engine Light Due to EGR Control Solenoid/Valve Failure on Cadillac Seville STS

The EGR control solenoid or EGR valve may fail causing the Check Engine Light to illuminate.

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Average mileage: 81,000 (81,000–81,000)
3 model years affected: 1990, 1991, 1992
4 people reported this problem
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1992 Cadillac Seville STS 81,000 mi,
some times run rough, idle s up and down.