Was also going to suggest you check the fuel filler cap. Did the dealer mention to you the emission control/safety system and how it is tied into the pressurized fuel tank?
If you remove the fuel filler cap while the engine is running or ignition switch is in position I., you may get an "engine check" condition. The computer reads the dropped pressure in the fuel tank and believes you may have a fuel leak or that the emission control system is defective.
V70's from late 90's to 2000 may even have this error "latch on" and had to be reset by the dealer. Later models may recover OK if you tighten the fuel filler cap as you did.
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