Voiding Your New Car Warranty with Modifications

Voiding Your New Car Warranty with Modifications
July 19, 2019 gnuworld

If you’ve just bought a new car, you might be considering ways to make it look unique or to tweak its performance and handling. With anything and everything available online, modifying a car has never been easier. But do vehicle modifications void a new car warranty?

wheels lowered

It might not be worth risking the new car warranty and service plan to make the car look or perform better.

We consider what car modifications are allowed, and which ones aren’t.

What the warranty covers

The warranty on a new car is the manufacturer’s promise that the car will function correctly, without any failures, for a specific time or distance.

If any part covered under warranty breaks during the covered period, the manufacturer is obliged to repair or replace it at no cost to the customer.

New car warranty conditions

For the warranty to remain intact, certain conditions have to be met. Usually, these are straightforward things like using the car for its intended use – so no taking your sports car off-road or using your compact hatch to carry heavy loads.

Other conditions are generally that the car must only be worked on by authorised dealers using genuine parts, and that it must be serviced on schedule.

If the dealer’s conditions aren’t met, the manufacturer has the right to terminate the warranty.

Are any modifications allowed to a new car?

So where does this leave buyers with regards to new car modifications? The truth is that this is a grey area.

Manufacturers prefer it if a car is worked on only by them. They may also try to claim that adding any modified part will void your new car warranty.

However, this isn’t what the law says. Under the Magnuson-Moss Warranty Act, a manufacturer can void a new car warranty due to a modification only if it can be proved that the modified part was the cause of a problem.

Many third-party performance modifications won’t automatically void your new car warranty. However, if something goes wrong, it will be easy for the dealer to claim that the car was used outside of its normal working parameters and to void the warranty at that point.

Of course, sometimes performance parts can do damage to a car if not installed correctly.

It’s worth mentioning that reputable tuning companies usually offer their own warranties on any work they do.

Potential disadvantages of new car modifications

A downside of making modifications is that if there are any problems with a car, the manufacturer will likely check for car modifications and blame any modified part.

It’s understandable that manufacturers do this because tampering with a car’s factory settings can lead to damage if done incorrectly.

Something else to keep in mind is that certain car modifications are deemed unsafe and frowned upon by the law. They can lead to a car being impounded.

Insurance companies also look out for alterations because some modifications, such as speed enhancements, are deemed a higher accident risk. This may cause them to increase the cost of car insurance.

Also, if an accident occurs and an insurance company finds out that the car was modified without their knowledge, they might deny the claim or terminate the contract.

Approved modifications to a new car

Car modifications that will never void a warranty are enhancements offered by the manufacturer. For instance, manufacturers may offer performance packages or various body enhancements.

An example is the BMW 3 Series Performance Aerodynamics package, which adds external parts such as a carbon boot spoiler and front splitters.

Certain third-party car modifications are also usually allowed. Typically, this is where changes are for cosmetic purposes and won’t affect any of the mechanical or electronic components of the car.

Examples are window tinting, wrapping of any kind, seat covers, boot-liners, interior vinyl and racing pedals.

Third-party performance modifications

engine modified

Typical performance-related car modifications that can void a warranty include the following:

  • performance chips/ECU tuning
    To comply with emission regulations, ensure fuel consumption is low enough to be competitive and follow other laws, manufacturers often set cars to lower performance levels than they’re really capable of. A performance chip changes these settings to enhance performance.
  • performance exhausts
    A performance exhaust assists gasses in escaping to help the engine work more efficiently. If fuel and air exit the combustion chamber faster, more air and fuel can come in to increase power.
  • cold air intake
    This is another car modification that adds more oxygen to the engine to increase performance. The aftermarket intake takes in cooler air than the regular OEM intake. The cooler air brings more oxygen into the combustion chamber to add more power.
  • nitrous oxide
    Nitrous oxide is mainly used for racing, rather than for daily driving. When the nitrous oxide is heated up, it splits into oxygen and nitrogen. This makes more oxygen available for combustion. In turn, more fuel can be used, which results in more power.


  • turbos
    A turbocharger is a type of air pump that sucks in air, compresses it and then feeds the oxygen-rich air to the engine to increase performance.

Third-party visual modifications

If something goes wrong, a new car warranty may also be voided by a number of third-party visual modifications:

  • aftermarket wheels and tyres
    Changing the rims is one of the most popular visual upgrades to a new car. However, wheels that are the wrong size can harm a car’s suspension. If you’re thinking of changing the wheels or tyres on a new car, stick to the same size as the original OEM parts.
  • lowered suspension
    A lowered suspension doesn’t only look good. It also aids in the aerodynamics of the car since there is less air travelling underneath the vehicle. Various other suspension components can also be installed to improve road handling and cornering ability.

lower suspension

  • lifted suspension
    This is mainly done on off-road vehicles to increase the ride height so that it has more ground clearance. A lifted suspension can also increase visibility.
  • body kits
    Body kits typically consist of add-on parts such as a rear spoiler, front bumper, splitters and side sills. These give a car a sportier look and improve aerodynamics. These kids are in a bit of a grey area. They won’t affect the mechanical components of a car, but it’s still best to speak to the dealer before adding them.

body kits

  • aftermarket lighting
    A wide range of LED lights, from High-Intensity Display (HID) kits to various LED bulbs, can be installed in place of conventional interior or exterior car lights. These shouldn’t cause damage to a car’s electronics. However, if something electronic goes wrong, they may be blamed by the dealer.

These are just of the few visual car modifications which make changes to the suspension of the car and can void the new car warranty if something goes wrong.

What to consider about car modifications

It’s always advisable to find out from the dealer how particular aftermarket car modifications could affect your new car warranty. Also determine any impact on an extended warranty if you have one.

It’s also worth remembering that a modification could have a positive or adverse effect on the resale value of the car.

Some car fanatics might want to buy a car that is already modified. However, most people prefer to buy standard cars. There might be a market for a Nissan 350z drift car. But there probably won’t be much of a market for a Toyota Etios sprayed bright yellow and with custom rims and a body kit.

Consumers’ right to repair

Great news for consumers is that changes to the law may give them the “right to repair”.

This will remove the arguably unfair advantage of dealers. It will enable third-party operators to get the relevant training, tools and parts from manufacturers and to do repairs on peoples’ cars without voiding any warranties.

This means that consumers will be allowed to take their vehicles to workshops of their choice, helping control the costs of car maintenance.

When you’re looking for high-quality car parts – from electronic components and brakes to engine and cooling systems – remember that Masterparts has the widest selection for all vehicle makes and models.

At Masterparts, we pride ourselves on offering the widest possible selection of auto parts online and off. Contact us if there’s a part you need and we’ll be happy to help.

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