Uh actually, the issue is addressed by Nissan's written (aka express) warranty, which excludes warranty coverage for:
Failure to operate the vehicle in accordance with the
OWNER’S MANUAL
Misuse, such as using the vehicle to tow
Failure of a component not covered by warranty
Racing and competitive driving
Theft, vandalism, fire, or flooding (including engine
water ingestion)
Accident, collision, being towed
Repairs performed by anyone other than an authorized
Nissan dealer
Glass breakage, unless resulting from defects in
material or workmanship
Normal wear and tear, including dings, dents, chips,
or scratches
Damage caused by any automated or manually operated
car wash or by using a pressure washer
Nissan also excludes warranty coverage for:
DAMAGE OR FAILURES DUE TO ALTERATION
OR MODIFICATION
This warranty does not cover damage, failures or corrosion
resulting from or caused by:
Alteration, tampering, or improper repair.
Installation of non-Nissan approved accessories or
components.
Improper installation of any Nissan approved aftermarket
accessory or component.
A vehicle whose odometer mileage has been altered,
or the odometer repaired or replaced and the
actual vehicle mileage cannot be correctly and readily
determined.
Hence, if the Nissan dealer believes that the repair issue was caused by abuse or improper installation of an aftermarket part, Nissan can deny the warranty claim. Remember, the intent of any warranty is to cover "factory defects" for a limited period of time after purchase. The intent of any warranty is not to provide free repairs to your car. With that said, warranty claims are very fact dependent and depends on the dealer.
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