Which accessories will play nice with your warranty?

Most drivers want to put some sort of personal stamp on their prized vehicles, whether it’s for function or appearance, so it’s no wonder automotive accessories are a multi-million-dollar business. But what happens when those add-ons void a factory warranty and lead to repair bills?

First, in most cases automakers won’t put a blanket warranty-void stamp on any of their products just because someone bolted on an accessory. What almost all warranties have is a clause indicating that if a non-factory-sourced accessory causes a problem, the automaker won’t be responsible for the costs of that specific repair. One exception is the installation of any performance chips on an engine-control computer; this will usually nullify your full engine and transmission warranty.

Vinyl wrap and cosmetic bits: You’re usually pretty safe with any cosmetic dress-up bits, such as vinyl wrap or pin-striping. The same can be said for most static exterior body add-ons, such as front air deflectors, door-window vent visors, mud flaps, and running boards. But if any of these require drilling into body sheet metal, make sure any exposed edges are treated to minimize rust risks.

Audio-system upgrades: The same can be said for most audio-system upgrades, but DIY types need to know tying into today’s vehicle wiring harnesses must be done with care. Even the wrong type of connector, or a drop of solder can interfere with low-voltage signals. Also know circuits that appear to involve just one component may be used for several others.

Oversized wheels and tires: These can contain a hidden warranty risk. Most understand that a manufacturer might not cover a failed wheel bearing when a monster-sized wheel was bolted on, but a small-print clause in many warranties can expand this to the entire vehicle. That term dictates that a warranty may be void if the true mileage on the vehicle can’t be determined, which can happen if an odometer adjustment isn’t made.

When in doubt, shop OEM: If you want to play it warranty-safe with accessories, getting OEM (original equipment manufacturer) parts through a dealership is one way to keep things covered. Some aftermarket or non-factory units come with their own warranties, which may also cover any consequential damage to other original parts.