Carbon build up on 2024 cars with check engine

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Feb 11, 2025
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so 2024 imprezza low mileage, check engine light
2024 crosstrek check engine light
both cars annoying check engine, no solution our mechanic dealer suggested gas cap
finally brought it in, the cross trek my daughers car,
dealer said a carbon buildup its a problem there finding more and more less than 12 thousand miles.
next week they need it for two days, to go through engine remove the carbon and to go through the engine to find out what is going on, they don't have a clue. no charge its all under warranty barely 10 thousand miles on my car. i think around 12 thousand on daughters,
dealer was good, its warranty work no charge but still need cars for two days.
annoying two brand new cars, and im driving a 2013 dodge caravan that i never did anything but change the oil.
thoughts or any insights anyone,
like i said dealer and subaru canada has no clue
 

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