Other than asking them not to reprogram the PCM, TCM or FICM, then no, there really is no way to prevent it.
ABS light ?
On the way home with 20 sheets of sheetrock and 30 2X4's my abs light came on. When I take it to the dealer, do I have any way of making sure they don't try to do any flashes (if there are any) or anything to the computer, short of standing there and watching them? The truck has 17xxx on the odometer and runs just fine except for that awful turbo lag.
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