warm tips:1.9V battery should be in good condition, NEW & fully charged.2. Please make sure antenna fit in CORRECT position.3.Do tire reset outside instead of in the garage.4.Position of tires is also important, Front tires have to be straight.5. Sensors should be original OEM sensors which well programmed.6.This U508 is for tire sensor reset, but sensor programming is not possible.7.It won't work if you've purchased aftermarket sensors with wrong frequency.
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