[why?]

Originally Posted by billwot

Well, yes, mfrom a legal prospective, that's true (Moss-Magnussen Act)

But if the dealer denies the claim and says your mods caused the defect, what are really going to do about it. Are you going to pay the legal expenses to challenge them in court, hire independent expert witnesses to support your claim?

Yeah, it's sad that there is a law that is supposed to protect consumers, but trying to actually use the law is not really feasible for most folks, in most cases.

that is why the media exists. In our 24 hour news cycle auto manufacturers doing something wrong is a juicy story to some bored reporter at some tv station somewhere.