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Always ask about the certification and the of a mechanic before letting them fix your car.
If something goes wrong, the mechanic's will cover damages and usually provides you with a car you can drive until yours is fixed.

Prior to giving your car to a shop, know the costs of repairs.

If something is not clear, clarify it with the service adviser or mechanic before starting any repair on the car. This will give you a good idea of what you will be paying.