Car keys for Mercedes

Beware of buying used car remotes

In recent years, vehicle key technology has advanced rapidly, with new remotes and key fobs integrating complex security systems. But as these gadgets become more sophisticated, so too does the cost of replacing them. For example, purchasing a programmed remote key from a main dealer or garage typically costs over £250. As a result, many drivers are tempted by the seemingly lower price of used or reconditioned remotes available online.

However, while these second-hand keys can appear cost-effective at first glance, there are several potential pitfalls and hidden costs that buyers should be aware of. Here’s a closer look at why purchasing a used car remote may not be the bargain it seems – and why consulting with a specialist, such as Carsmith Midlands, can save you time and money in the long run.

1. Compatibility and locked transponders

A major issue with used car remotes is that many are “locked” to their original vehicles, especially for certain manufacturers like Volkswagen, Audi, Mercedes, and BMW. These locked transponders often cannot be reprogrammed for a new car, making the remote useless to its new owner. Other manufacturers, including Fiat, Honda, Skoda, Seat, and most Peugeot and Citroën models, also use locked transponders, which can cause the same problem.

If you’re considering a used remote, keep in mind that there’s no guarantee it will work with your vehicle, even if it looks identical to the one you need.

2. Identical appearance, different Internals

Buying a remote that looks identical to your current key is another common trap. Manufacturers like Peugeot, Citroën, VW, and Audi all make remotes that appear the same on the outside but can differ significantly on the inside. These internal differences mean the remote may not work with your vehicle, even if it visually matches your existing key. For Peugeot and Citroën models, for instance, the only way to ensure the correct remote is through the VIN (Vehicle Identification Number), as year and model information alone are insufficient.

3. Additional costs of reprogramming and key cutting

While a reconditioned remote might come with a lower price tag, programming it to your car often involves additional expenses that are easily overlooked. On average, around 70% of used remotes require transponder chip replacement before they can be reprogrammed—a cost that can quickly add up. Moreover, you may need to find a locksmith who is equipped to cut a new mechanical key and reprogram both the transponder and remote, often at an extra charge.

The expert advice advantage

When weighing the options, buying a used car remote may seem like a bargain, but the reality is often quite different. Reprogramming challenges, compatibility issues, and hidden costs frequently offset any initial savings. Consulting with a professional locksmith service like Carsmith Midlands can help you avoid these pitfalls and ensure you get a remote key that works seamlessly with your vehicle.

At Carsmith Midlands, we offer competitive prices on new remote keys and programming services. Our expert locksmiths are experienced in dealing with the complexities of modern car key technology, providing an affordable alternative to dealership prices and giving you peace of mind knowing your key will work without issues.

If you’re considering purchasing a used remote, why not get in touch with us first? We’re here to provide advice, answer your questions, and help you make an informed decision that won’t cost you more in the long run.