Aftermarket Key Fobs for Locksmiths: Test a Supplier First
By · Last updated: October 28, 2026
Before you stock an aftermarket key fob, test one or two from the supplier on a real vehicle. Check that the identifiers match, the fob programs and every button works, then decide how many to buy.
A simple test routine
- Check the identifiers. Compare the FCC ID, button layout, shell shape and key blade against the original fob or the vehicle’s requirements. Use the FCC ID lookup table to confirm the match.
- Inspect the build. Look at the case seam, button feel, battery holder and the emergency blade.
- Program it. Pair it to a vehicle with your programmer and confirm that the car accepts the fob. See our key programmer guide.
- Test every function. Lock, unlock, trunk or hatch, panic and remote start if the original has it.
- Test range and battery. Check lock and unlock from a normal distance, and note which battery it uses.
- Note how it fails. If the fob does not pair, find out whether the cause is the part, the vehicle procedure or your tool before you call it a defect.
Questions to ask the supplier
- How are returns handled when the part does not fit the vehicle?
- Who do I contact to confirm a fitment?
- Are the listing’s identifiers the FCC ID, part number and button count?
- Do you ship from within the United States, and how fast?
Start small, then scale
Order a small pack, test it, then repeat the order in larger packs for the models you use most. Read the pack-ordering checklist to avoid ordering the wrong quantity. Customers who ask about cost may also want to read what an auto locksmith charges.
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