Engine problems are expensive and serious. An engine that has experienced internal damage will need comprehensive repair or replacement. Problems like broken rods, damaged valves, or oil leaks can be expensive to address. High mileage can also be a cause for engine replacement, in addition to problems with other vital components like transmissions and radiators. In these situations, it is important to consider the value of your car in relation to the costs of this type of work. Engine replacements can cost anywhere from $3,000 to $4,000. The ultimate cost depends on the type of vehicle, engine, and the shop.