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Your situation usually happens to those who overfill. Once the filler nozel clicks off, do NOT add more gasoline. The added amount will flow to the charcoal canister, filling the vapor only line with liquid gasoline. This will cause the EVAP system to not draw a vacuum and set a code.
You really should get the code read and deleted after the CEL gets set. At least you will know what the problem is.
Also, the engine cannot be running when the gas cap is off, regardless of how cold it may get for your passengers.
Klaus
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Proud owner of a 220S. If I had more room, I would have more Volvos.
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