DODGE CARAVAN ENGINE POOR MILEAGE

The Transmission Would Not Go Out Of Low Gear And The Dealer Ended Up Switching The Ecu And Now When I Fill Up Instead Of Having 800km Dte I...

My Van Used To Have A Reading Of 13l/100 But Now It Reads 17l/100 And It Is Has A Bad Fuel Consumption. My Question Is How Do I Reset The...