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Malt So what kind of fraud is it? And who is it up to, to prove if it was? LOL.
Deal with it in your own way. I will do it my way.
I had credit guy at subaru try to sell me extended warranty and tell me that servicing my own car "voids the warranty". We spent 30+ minutes arguing over this warranty bs, I wanted my car and to get out of there already so I just said, "show me how servicing my own car voids me warranty IN WRITING, and I will show it to my attorney." he shut up, and I was out within 5 minutes.
The warranty work I've done was- interior auto-dimming mirror that turned black, which was rejected as a "wear item" from sun exposure.(ITS INSIDE THE CAR!) Also an ecu that was "replaced" and then I checked it, it was the same one with the same scratches I put on it!(they robbed their parent company lol). Every car I've done service or bought parts for, at Infinity, Lexus, Nissan, Toyota, Mercedes and now Subaru, I've caught mistakes/shady dealings from the service/parts people trying to pull a quick one on me. It's not always a you vs them mentality, but they are in the business to make money and to convince people they need something they don't, so it helps their bottom line.
It's up to me to prove I did my service if they ask.
It's up to them to prove I am trying to defraud them or not.
Grey or Gray? Black right or white right? Interpret it your own way. I'm over it.
p.s. exhaust after all the sensors has no effect on knock. by you assuming it can affect it, it means you side with the dealer and would deny warranty based on an exhaust which has ZERO bearing to the front side of the engine.