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

Problem Description and Possible Solution

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

Problem Data
RepairPal Verified
Average mileage: 81,000 (81,000–81,000)
3 model years affected: 1990, 1991, 1992
4 people reported this problem
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some times run rough, idle s up and down.