john3976 said:If the aftermarket part is what caused the failure then the manufacture under the law can refuse the repair, this is the problem, something happens to the car or truck, the dealer sees an aftermarket product on the car or truck, no diagnostic service, just sees the product, warranty voided on the spot.
That is what is against the law, most of the problems are not caused by the aftermarket parts, as they are failing at the same rates on stock trucks or cars.
The dealers know 99% of the people will feel powerless to fight them and will just pony up the several thousand dollars to fix a problem that was a defect that was going to happen no matter if the aftermarket part was there or if the vehicle was bone stock.
Why should anyone have to pay for something that should be covered under warranty when it is failing on stock vehicles as well?
I'm still not convinced of your argument that there are numerous failures on injectors, or anything else that you have posted.
Hypothetically, if DC did tear into a truck to diagnose, and found that the failure was caused by aftermarket parts, would you support DC charging the customer for the diagnostic?
If aftermarket parts are, as you say, "an improvement" over stock, why don't you expect the aftermarket guys to stand behind them??
If what you are suggesting is so rampant, it seems that you would have a perfect case for a class action lawsuit. Maybe you should jump in front of that one.