SH-AWD AND CHECK ENGINE LIGHT ARE SHOWING ON DASH BOARD - BROUGHT CAR FOR DTC -

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FOLLOWING SHOWS P0420 AND P0299 - DEALER CHANGED CAT AND 2 SENSORS UNDER WARRANTY NOW SAYS IT IS MY TURBO -CAR WAS RUNNING FINE UNTIL I BROUGHT IT IN - WANTS $6K FOR REPAIR 50,000MILES ONLY.