Q: Emissions system

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Purge valve was replaced last week and engine light came back on 4 days later. Mechanics at shop say now I need a new gas cap. Is This coincidental that both stopped working at same time? It feels like I paid $170 last week was for nothing especially if it's just needed a gas cap. Thoughts please and recommendations

My car has 64000 miles.
My car has an automatic transmission.

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