Comparison Aftermarket vs OEM Keys

Aftermarket vs OEM keys. The honest comparison.

Customers ask this constantly: are aftermarket fobs actually as good as OEM? The honest answer surprises some people. This comparison walks through what's really different between the two, when each is the right choice, and what to look out for when buying aftermarket.

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The two options,
side by side.

Option A

OEM Key

Original-equipment fob from the manufacturer (BMW, Mercedes, JLR etc.). Branded, packaged, supplied through official channels. Premium cost.

Option B

Aftermarket Key

Identical-spec fob produced by a third-party manufacturer. Same chip, same buttons, same function. Different branding (or no branding). Lower cost.

2 opts
Compared in depth
10
Detailed comparisons
20+ yrs
Industry experience
5.0★
Google rated

Feature by feature,
how they compare.

Feature
OEM Key
Aftermarket Key
Internal chip
Manufacturer-spec transponder chip.
Identical manufacturer-spec transponder chip (same supplier in many cases).
Buttons & layout
OEM design and tactile feel.
Same layout, same buttons, sometimes slightly different button feel.
Range & signal strength
OEM antenna and electronics.
Same antenna spec, equivalent range. Tested to identical standards.
Programming process
Identical — no different to programme.
Identical — no different to programme.
Exterior branding
Embossed manufacturer logo (BMW roundel, Mercedes star outline, etc.).
Usually unbranded or generic. Some aftermarket carries reproduction logos (legality varies).
Mechanical key blade
OEM blade pattern, OEM materials.
Same blade pattern, same cut, equivalent materials.
Build quality variance
Consistent — OEM QC is tight.
Varies by supplier. Premium aftermarket (Silca, Xhorse) is dealer-quality; cheap eBay options often aren't.
Cost
Significantly higher (typically 2-4x aftermarket).
Significantly lower than OEM.
Warranty when fitted by us
12 months on the part.
12 months on the part.
Resale impact
Some buyers value seeing OEM keys with the car.
Most private buyers don't notice or care, especially for lower-value cars.

When OEM Key
is the right choice.

OEM Key comes out ahead in these scenarios — straight talk about when this is the answer.

Selling a premium car soon

If you're selling a a premium car in the next 6 months, OEM keys with original packaging look better in the handover. Marginal but real for the high-end resale market.

Original-keys-only preference

Some owners simply prefer the OEM look and feel. Not irrational — branding and tactile quality are real value. If it matters to you, pay for OEM.

Specific OEM design (e.g. M-series)

BMW M-series fobs have a distinct visual style (red detail, M-tri-colour stripe). The aftermarket versions don't reproduce this. If you specifically want the M-look, OEM only.

Some lease return conditions

Some leases stipulate "original manufacturer keys" on return. Check your contract. Most don't specify, but a few do.

When Aftermarket Key
is the right choice.

Aftermarket Key comes out ahead in these scenarios — honest about where it has the edge.

Routine spare key work

For a daily-driver needing a backup key, aftermarket is the obvious choice. Same function, fraction of cost, no downsides.

All-keys-lost on out-of-warranty cars

For cars 3+ years old, the cost saving on AKL is substantial and the resale doesn't care about OEM vs aftermarket.

Family / second-key scenarios

A second key for a spouse, child, or driver isn't the "main" key — aftermarket works perfectly.

Most BMW, Mercedes, Audi, VW group spare keys

For mainstream German marques, premium aftermarket fobs (Silca, Xhorse) are indistinguishable from OEM in operation. Save the money.

The chip inside an aftermarket fob is, in many cases, made by the same supplier as the chip inside the OEM fob. Functionally they are the same product with different stickers on the case. We offer both — most customers pick aftermarket for spare keys and the cost saving runs into hundreds. Where OEM specifically matters (premium resale, M-series branding, lease contract requirements), we supply it.

Get a quote
Honest advice,
fixed quote.

Not sure which option fits your situation? Send your registration and a brief description — we'll tell you straight whether independent or dealer is the right fit for your specific job. No upselling, no padding.

Common questions.

Are aftermarket keys safe?
Yes when sourced through proper channels. Premium aftermarket manufacturers (Silca, Xhorse, Lonsdor) supply dealer-quality fobs to professional locksmiths globally. They use the same Texas Instruments / NXP / Atmel chips as OEM. Cheap eBay no-name fobs are a different story — those can be unreliable.
Will an aftermarket key work the same as OEM?
Mechanically and electronically identical for most major brands. Same chip, same antenna, same range, same buttons, same blade pattern. The car cannot distinguish between them once programmed. Only the exterior branding differs.
Does fitting an aftermarket key affect manufacturer warranty?
No — UK Block Exemption Regulation prevents dealers from voiding warranty over independently-supplied parts. Aftermarket keys are routinely fitted to cars under warranty without issue.
Why are OEM keys so much more expensive?
Manufacturer markups on parts are significant, plus dealer-only distribution adds further cost. The cost-to-make of an OEM fob and an aftermarket fob is in many cases similar; the price-to-buy is very different.
What's the catch with aftermarket?
Quality varies enormously by supplier. Premium aftermarket (what we use) is dealer-quality and lasts as long as OEM. Cheap eBay generic fobs are often unreliable, weak signal, short battery life, sometimes don't programme cleanly. We use the good stuff.
Do you carry both OEM and aftermarket?
Yes — we stock both for most common platforms. We default to discussing both options when you book; the choice is yours based on the trade-offs that matter for your specific car.

Free quote.

Send your registration and we'll confirm exactly what's involved — fixed price, no surprises. Most quotes back within minutes, 7 days a week.

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