check engine light on BMW 325i

Average mileage: 87,182 (30,000–156,456)
2 model years affected: 1995, 2004
8 people reported this problem
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problem details
I've had this problem (and 2 Gas Caps) for about 20,000-25,000 miles, and two BMW Service Reps while the car was under Warranty said to me, "Oh, that's just the Gas Cap". Then I went in last month, and the new Service Rep was all upset, "Egad, you're SVC ENG SOON LIGHT IS ON, we better do something NOW!!!" So I told her what her 2 or 3 predecessors had told me while the car was still under Warranty. Anyone know the true answer?
Unable to keep gas pressure in gas tank caused by fuel filler neck won't seal.
Gas smell when car is parked in garage. I have replaced the fuel cap.
2004 BMW 325i 30,000 mi,
BMW Ft Pierce told me that I should just ignore it.
2004 BMW 325i 156,456 mi,
Was told by mechanic tank needed to be replaced