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Fuel odor in the interior of the vehicle is not something that should be diagnosed on the internet.

There are several things that could cause that symptom, but I don't think a leaking fuel injector is very likely. Depending on how it was leaking, a check engine light or other driveability symptoms would be more likely to be present with a leaky injector.

More information about the conditions present when the odor is noticed would be needed. It may be perfectly normal if for instance it is present during a cold start at idle with the vehicle stationary. In that case the fuel smell could be just cold start fuel enrichment from the exhaust making it to the HVAC fres air intake.

Have your son observe very closely the conditions when the symptom occurs and take it to a mechanic. No way to know if it is under warranty, but if it is truly a problem, it needs to be taken care of either way.
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