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Car door lock actuator, door handle, and door mirror replacements.Crankshaft harmonic balancer replacement.However, air conditioning, alternator, and brake issues are also common needs of a BMW X3. Maintenance and repair costs range from $80 to $4473, with oil changes being the most common service you'll likely pay for on your vehicle. Per Your Mechanic, the estimated average cost to repair a BMW X3 is $318, which includes the average cost for maintenance. What Is the Estimated Average Cost to Repair an X3? Learn about maintenance costs for the BMW X3 in this guide. A BMW dealership should be able to provide its customers with a cost estimate for common repairs and service that a vehicle may need after the manufacturer's warranty has expired. When considering a new or used vehicle purchase, owners need to look at the price of the car and calculate the total cost of regular car payments, scheduled maintenance, and major repairs that may come up. The maintenance cost for a BMW X3 can vary and depends on several factors that can increase or decrease the average amount an owner can expect to pay for these vehicles.