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I had a similar problem in my 2000 V40.
Turns out there was a bad check valve in the gas tank
vapor recovery system. The symptoms are similar. This
can also be caused by a loose cap.
The problem has not recurred in my circumstance.
However, if the code read by the dealer is indeed poor
gas quality, then you might have some other problem, indeed
related to the fuel. I'd ask if they're sure about the code,
and for them to check that it is indeed a bad fuel code or
the bad fuel evaporative recovery system code.
Good luck.
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