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My car shows "Engine Failure mood" when I make sharp right turn, I taook it to dealer, the mechnics diagnose it as coil and plug prolem. It shows the coil 3 has problem, rest of coil and plug looks ok now. They suggested to change all coil and plug and cost about $1400+,but if only change the coil+ plug 3, one with problem now, then it cost about $400. I am not sure if the price is reasnable, and should I change all, or just one, the third one with problem? Many thanks!