If your vehicle keeps having problems and you’ve made aftermarket changes, you may be asking: Does aftermarket work affect my California Lemon Law claim? The short answer: not automatically. But certain modifications can complicate a claim if the manufacturer argues they caused the defect.
Modifications Do NOT Automatically Disqualify a Lemon Law Claim
Under California Lemon Law, a manufacturer cannot deny your claim simply because your vehicle was modified.
However, the manufacturer may try to deny responsibility if it can prove the modification:
- Caused the defect, or
- Interfered with diagnosis or repair
The burden of proof is on the manufacturer, not the consumer.
How Common Modifications Are Treated
Low Risk Modifications
Modifications that typically have no connection to mechanical defects rarely affect lemon law claims. These can include:
- Window tint
- Vinyl wraps or paint protection film
- Wheels that meet factory specifications
- Interior upgrades
Higher Risk Modifications
Modifications that are usually acceptable unless poorly installed can include the following:
- Aftermarket stereos
- Backup cameras
- Dash cams
- Alarm systems
Keep installation receipts to show professional work.
Aftermarket Repairs vs. Modifications
There’s an important difference:
- Aftermarket repairs fix a problem
- Modifications change how the vehicle operates
Having repairs done outside the dealership does not automatically hurt your claim, especially if the defect existed before the repair. Separately, under the federal warranty law, manufacturers must prove an aftermarket part caused the problem. This protection works alongside California Lemon Law.
How to Protect Your Claim If Your Vehicle Is Modified
To strengthen your case, know that documentation is key in modified vehicle cases. Keep all repair orders, save installation receipts, and document when the defect first appeared. Make sure repair orders accurately describe the issue and avoid arbitration without legal advice.
Can I Still Get a Buy-Back or Settlement If My Vehicle is Modified?
Yes. Many modified-vehicle cases still result in buy-backs, cash settlements, or vehicle replacements. Each case depends on the type of modification, type of defect, and repair history. Aftermarket work does not automatically disqualify a California lemon law claim. What matters is whether the modification actually caused the defect — and manufacturers must prove that connection.
If your vehicle keeps breaking down, don’t assume you’re out of options.
Free Lemon Law Case Review
The attorneys at California Lemon Law Services can review your case for free — even if your vehicle has modifications.
*No upfront costs
*Manufacturer pays attorney fees
*Buy-back, replacement, or cash settlement
