I wonder how an extended warranty handles/addresses aftermarket tunes in their coverages (or denials)?
I would guess that like any added items, if the damage to an OEM part was linked to an aftermarket part/system, then the OEM part would not be covered under the factory or ESP warranty. The following is from the Warranty Guide;
Damage Caused by Alteration or Modification
The New Vehicle Limited Warranty does not cover any damage caused by:
• alterations or modifications of the vehicle, including the body, chassis,
or components, after the vehicle leaves the control of Ford Motor
Company
• tampering with the vehicle, tampering with the emissions systems or
with the other parts that affect these systems (for example, but not
limited to exhaust and intake systems)
• the installation or use of a non-Ford Motor Company part (other than
a certified emissions part) or any part (Ford or non-Ford) designed
for off-road use only installed after the vehicle leaves the control of
Ford Motor Company, if the installed part fails or causes a Ford part
to fail. Examples include, but are not limited to lift kits, oversized
tires, roll bars, cellular phones, alarm systems, automatic starting
systems and
performance-enhancing powertrain components or
software and performance ‘‘chips’’.
Peter