Quote:
Originally Posted by Tcoat
Right from the warranty docs.
They say it twice.
This warranty does not cover damage or failures resulting directly or indirectly from any of the following:
Modification, alteration or tampering, disconnection, including installation of non-Toyota Accessories
• Repairs and adjustments caused by improper maintenance, lack of required maintenance and/or the use of fluids, fuel, oil, or lubricants other than those recommended in your Owner’s Manual
• Installation of non-Toyota Parts
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Warranty language doesn't supersede federal law.
Modifications beyond stock and the use of non approved parts
is not a guaranteed warranty denial no matter who installed them.
It's literally in the first line of the text you quoted. The onus is legally on the manufacturer which they will almost always try to get out of. The problem is most people aren't willing to lawyer up, understandably so.
https://www.law.cornell.edu/cfr/text/16/700.10