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My Chrysler Concorde lxi 2002 runs rich.It consumes up to 22 liters per 100km or 10.3 per gallon. What are the probable reasons of that?

\015 Timing chain,spark plugs - checked and found to be in normal state, a/v and generator belts -replaced. Vacuum Leak Detector(NVLD) -replaced. Engine light is on due to errors P0158/P0138 - Oxygen Sensors malfunction. Talked to a mechanic about that issue and he told me that the sensors are hardly the reason of such an overconsumption\015 Posted / edited by AnonymousUser on : 10-05-2021

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