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So, they can’t dictate what brand of parts you put on your car during the warranty period. Mr. Goodwrench, Motorcraft and Mopar are optional. But simply swapping parts is not the area of greatest concern here. The real concern is vehicle modification.
Many modifications people do to their cars fall outside of the “article or service” contemplated by the statute. Suppose you loved the way Vin Diesel could pull wheelies in 13th gear in his Charger and figured a little of that “NOS” would do the same for your car. Even if your little four-banger won’t pull wheelies in any gear, it now puts out a few more horses than before. So, if you find the transmission spitting out teeth like it’s been punched in the mouth by Mike Tyson, you can bet the manufacturer might blame the problem on the increased power being fed to the trans.
The Magnuson Moss Warranty Act requires manufacturers to honor their warranties and auto manufacturers only warrant their vehicles against manufacturing defects. Your claim here could be denied because the failure was not due to a defect in a factory component. It was caused by something added to the car: the nitrous oxide injection system which was not part of your car to begin with. That system caused a non-defective part to fail. Your mod did not void the warranty. It’s just that the failure was not caused by a factory defect.
Other popular modifications might likewise be problematic. Companies sell aftermarket modifications for Electronic Control Units which range from new programming to high performance replacement units. The net result is that the engine is now being controlled by a program unlike the one your car shipped with. Manufacturers know these mods exist and these will also run afoul of warranty coverage. Many Owner’s Manuals specifically state that warranty coverage does not extend to changes to the vehicle’s “configuration” and this limitation is not forbidden by the Magnuson Moss section cited above. The manufacturer is not requiring you to use a particular brand of item or service, they just don’t want you using one that is altered to different settings than those configured at the factory. Or, put it this way: If your ECU went bad and needed replacement, you could replace it with one of any brand you liked, so long as it controlled the engine the same as the original.
Expect your warranty claim on your drivetrain to be scrutinized if you come in with a hopped up ECU. These claims are routinely denied so long as the failure appears to be related somehow to the new – altered – performance parameters of the ECU. And this is perfectly legal according to the Federal Trade Commission which is the government entity charged with creating rules to implement the Magnuson Moss Warranty Act.[...]
