2004 Hyundai XG350 Q&A

2004 Hyundai XG350 Question: egr valve

I recntly bought this car and had the egr valve replaced and my check engine light still comes on what could be the problem? -
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The same shop checked the light and repaired and now it has come on for the 3rd time after just a few days of last repair. Am I being ripped off?