Does a warranty cover aftermarket parts?
It depends
A dealer or manufacturer can't void your whole vehicle warranty just because you installed aftermarket parts — but they don't have to cover damage a specific aftermarket part actually caused.
- Covered when The aftermarket part has nothing to do with the failed component — the rest of the warranty stays intact.
- Not when The manufacturer or dealer can show the specific aftermarket or recycled part caused the damage being claimed.
What flips the answer
- Covered when
The aftermarket part has nothing to do with the failed component — the rest of the warranty stays intact.
- Not covered when
The manufacturer or dealer can show the specific aftermarket or recycled part caused the damage being claimed.
Key facts
- Verdict
- It depends
- Applies to
- aftermarket parts · Warranties
- Covered when
- The aftermarket part has nothing to do with the failed component — the rest of the warranty stays intact.
- Not covered when
- The manufacturer or dealer can show the specific aftermarket or recycled part caused the damage being claimed.
- Verified
- 2026-07-02 · 2 primary sources
The Magnuson-Moss Warranty Act makes it illegal for a manufacturer or dealer to void your entire warranty, or deny an unrelated claim, simply because you used aftermarket or recycled parts, or had repairs done outside the dealership. A blanket "aftermarket parts void your warranty" policy is not legal.
The exception is narrow and specific: if an aftermarket or recycled part is defective, or was installed incorrectly, and that failure damages a part the warranty would otherwise cover, the manufacturer or dealer can deny coverage for that damaged part and charge for the repair.
The burden is on the manufacturer or dealer — they have to show the aftermarket part actually caused the damage before denying a claim on that basis, not simply assume it because the part is present.
What people typically pay
When the aftermarket part is unrelated to the failure, the warranty covers the repair as normal, though what you pay out of pocket can vary by plan and any deductible your warranty carries.
If the dealer proves the aftermarket part caused the damage, you pay for that repair yourself, and repair costs vary widely by vehicle and the component involved.
Amounts vary widely by vehicle, the component involved, and whether the part maker offers its own guarantee that might reimburse you.
How to actually get it covered
When a claim is denied, ask the dealer or manufacturer for the denial in writing, including exactly which aftermarket part they say caused the failure and their evidence for it.
Gather your documentation — purchase receipts for the aftermarket part and records of repairs and maintenance showing the vehicle was properly maintained.
Point them to the Magnuson-Moss Warranty Act and note that the manufacturer or dealer must prove the specific part caused the damage before denying coverage.
If they can't show causation, escalate to the manufacturer's customer service rather than just the local dealer.
File a complaint with the FTC if the denial stands without proof of causation.
If the aftermarket part carries its own warranty, you may be able to file a separate claim with the part manufacturer.
Common questions
If a dealer tells me my warranty is void because I installed a cold air intake, is that legal?
No. Under the Magnuson-Moss Warranty Act, a dealer cannot void your entire warranty just because you added an aftermarket part. They can only deny coverage on a specific component if they can prove that part caused the failure. A blanket "void" statement is not enforceable.
How do I fight a denial when the dealer blames my aftermarket part?
Ask them to put the denial in writing and to identify exactly how the aftermarket part caused the failure — the burden of proof is on them, not you. Keep your installation and maintenance records showing the part was installed correctly and the vehicle was properly maintained. If they can't demonstrate causation, you can escalate to the manufacturer's customer relations, file a complaint with the FTC, or pursue a claim under Magnuson-Moss.
Does it matter whether a mechanic or I installed the aftermarket part myself?
The law protects you either way — using an independent shop or doing your own work can't void the warranty by itself. What matters is whether the part or its installation actually caused the damage being claimed. Keeping installation and maintenance records can help you if a dispute arises, but they aren't legally required to keep the rest of your warranty intact.
Does this same protection apply to used or recycled parts, not just brand-new aftermarket ones?
Yes. The FTC states your warranty stays in effect if you use aftermarket or recycled parts — a dealer can't void your warranty simply because a used part is present. As with any part, coverage on a related component can be denied only if that specific part is shown to have caused the failure.
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