One reason is the dealer likes to scare people and tell them if they change anything it will void the warranty.The dealer can even do it themself with the tech 2 scanner they have. But usually the salesmen or service writer do not know it. Reprogramming for different tires has been done for years. When they went to the OBD II ECU's in 96 Flash programming was the only way to make those kind of changes.
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