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Any one know this Combustion chamber clogged w/carbon. chemical cleaning needed on 2011 Hyundai Santa Fe

check engine lite came on-still in warranty. dealer said "actuator for butterlies that run thru intake manifold" broke due to "combustion chamber clogged w/carbon" they will warranty replace actuator, but i must pay for "chemical cleaning of combustion chamber" car has 38K miles, 2 yrs old. Never had that issue on my 10 yr old toyota w/150K miles. is the dealer telling me something legit or blowing smoke up ...

Asked by for the 2011 Hyundai Santa Fe
wow carbon can build up but never seen that.i just cleaned my tundra at 45k miles and it wasn't bad at all.there might be some smoke going on
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I see smoke........and I'm on the East coast!!!Ask to see the supposed carbon build-up (not photos of another engine)on your engine.