A cheap repair may not be good and a good repair will probably not be cheap. If your vehicle is less than five years old and has a strange problem, the dealer is usually familiar with these kinds of problems, and there may be some kind of factory help offered. If you feel you are being taken advantage of then you probably are. Don't be bullied, especially by a mechanic with wrench in hand, just leave. Regular maintenance is the best thing for your vehicle and the dealer does not have to perform it to maintain the warranty.
Many shops fill the maintenance requirements at reduced rates.
Today's technician must access and understand about 500,000 pages of text. His training requirements are hydraulic, mechanical, electrical, and computers.