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433 mhz is a very large spectrum spec to live within, much as you have channels for wifi. Not to mention am and fm, proprietary code between manufacturer, code specifically locking out brands......ect. Plus you have to reverse engineer and custom code the vehicle to accept the new data in addition to the hardware changes if they are using a different frequency and modulation.
Short answer, if the light on the dash bugs you, spend the $200 bucks and get the right sensors
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