You approved the estimate. It listed OEM brake pads, a genuine manufacturer belt, the name-brand filter. You paid for those parts. But when your car came back, did it actually get them?
Parts substitution fraud — billing for premium parts and installing cheaper ones — is one of the most common forms of shop fraud precisely because it's so hard to catch after the fact. Here's how to reduce your exposure.
Ask for the Old Parts Back
Before you authorize any repair that involves replacing physical components, tell the shop you want your old parts returned to you. Legitimate shops do this routinely — it's not unusual or confrontational. If they push back or make excuses, that's worth noting.
Getting the old parts back serves two purposes: it confirms the work was actually done, and it closes one avenue for billing you for a replacement that never happened.
Request the Packaging
For higher-value parts — filters, sensors, brake components, belts, gaskets — ask to see the box. Part numbers are printed on the packaging and can be cross-referenced against manufacturer databases. An OEM part from your vehicle's manufacturer will have a part number that matches. A generic aftermarket part won't.
This doesn't mean aftermarket parts are always wrong — many are fine, and some are genuinely better. The problem is being billed for OEM and getting aftermarket without being told.
Understand the Difference Between OEM, OE-Equivalent, and Counterfeit
- OEM (Original Equipment Manufacturer) — Made by or for the vehicle manufacturer; typically the most expensive option
- OE-equivalent aftermarket — Meets the same specs from a reputable brand like Bosch, NGK, Denso, or Gates; often a perfectly acceptable choice at lower cost
- Cheap no-name aftermarket — Variable quality; fine for some applications, problematic for others
- Counterfeit — A serious and growing problem, especially for safety-critical components
"The fraud isn't always about counterfeit parts. Sometimes it's simply billing you for a $90 OEM filter and installing a $12 generic one without telling you."
The Counterfeit Airbag Warning
This is where parts fraud stops being about money and becomes about safety. U.S. Customs and Border Protection has been seizing counterfeit airbag inflators at significantly increased rates. These components can fail to deploy, deploy incorrectly, or deploy with dangerous force.
Counterfeit airbags have been linked to confirmed deaths. If your vehicle has had collision repair or airbag deployment work done at a shop you don't fully trust, it is worth having the airbag system independently inspected.
Signs a replacement airbag may not be legitimate:
- No part number visible on the unit
- Packaging that looks inconsistent or has spelling errors
- Price significantly below market rate for the same component
- Shop reluctant to document the specific part installed
Price-Check Before You Approve
For any repair involving expensive parts, spend five minutes before approving the estimate. Look up the part number on the manufacturer's parts portal or a reputable aftermarket supplier. If the shop is billing you $280 for a part that retails for $90, ask the question. Markup is normal — 30–50% is common — but 200%+ on parts combined with unwillingness to show you what they're installing is a red flag.
EthicalMechanic.org helps you find shops that operate transparently — where what's on the estimate is what goes in your car. That should be the baseline expectation for any repair.