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Questions tagged [cvn]

Calibration Verification Number

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mazda dealer thinks i have changed the CVN code in my car

My mazda dealer thinks I've chiptuned my car even though I didn't. Help what to do. Here's their message: I could again find no DTC and as there was also no manual data started with checking the ...
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Is the Calibration Verification Number (CVN) unique

Is the Calibration Verification Number (CVN) unique across all cars?