The defect or part is not covered. Product failure is due to misuse or lack of proper maintenance. You have made significant modifications to the product, which has affected its performance. A manufacturer or supplier may void your warranty if you do not comply with the terms of the contract.
Some situations will void the entire warranty, meaning that you will no longer be able to file claims for repairs. Manufacturers may deny warranty coverage if an aftermarket part or modification caused damage to the vehicle. But they must be able to prove that the replacement part caused the damage. Like any other contract, both the owner and the manufacturer can breach a car's warranty.
When manufacturers provide guarantees, they undertake to carry out repairs as long as the purchaser of the car meets certain conditions and maintains the vehicle in a reasonable manner. If you don't keep your end of the deal, your manufacturer can do the same. A new car limited warranty, sometimes called a “bumper-to-bumper warranty,” is a contract between the vehicle owner and the automaker. You agree to take care of any applicable repairs provided that the owner properly maintains the vehicle.
But like most contracts, a warranty can be broken if a person doesn't live up to their end of the bargain. That's why it's important to know what circumstances may void that coverage.