Adding an aftermarket body kit to your car can transform its look into a high-performance aesthetic, but numerous enthusiasts make costly oversights during the process that can accidentally invalidate factory coverage.

One of the most common errors is using non-OEM approved parts. Most automakers state that modifications to the exterior, especially those not provided by the OEM, can invalidate warranty coverage. Even if the body kit looks factory correct, if it’s not approved by the automaker, any warranty submission—such as damage to the frame or aerodynamic components—could be rejected.

Another critical misstep is improper installation. Body kits often require drilling, cutting, or bonding to the vehicle’s factory frame. If these work is performed without proper technique, they can weaken the vehicle’s framework. Consider this: altering structural reinforcements without adequate structural bracing can lead to corrosion, poor handling, or catastrophic failure. When warranty inspectors notice that such non-compliant work led to the breakdown, they will likely refuse to honor warranty repairs.

Poor quality adhesives or fasteners are also a critical concern. Many DIYers use cheap epoxy to avoid professional labor. But these may degrade in heat, cold, or moisture. If the body kit comes loose and causes damage to other components like the radiator, sensors, or wiring harnesses, the manufacturer may argue that the damage resulted from an aftermarket modification and refuse the claim.

Failing to have the installation performed by a certified professional is another dangerous oversight. Many warranties require that modifications must be completed by factory-trained staff to maintain vehicle safety certifications. When installed by an uncertified mechanic without proof of training or manufacturer approval, it becomes difficult to prove that the work was done properly, and the warranty may be canceled retroactively.

Finally is not informing your insurance provider or dealership about the modification. Insurance companies may refuse to cover damages related to the aftermarket exterior parts, and dealerships often inspect vehicles during service appointments. If they spot unapproved modifications, they may retroactively void parts of your warranty.

To protect your warranty, always verify policy restrictions before starting before beginning any modification. Opt for OEM or manufacturer-approved aftermarket parts, use a factory-authorized shop, offroad auto part and keep all receipts and documentation. A well executed body kit can deliver stunning aesthetics while preserving protection—with proper authorization and technique.