The reason you should never attach extra keys to your car’s ignition key

Your car’s ignition key does more than just bring the engine to life—it plays a vital role in everyday mobility. However, a common habit many drivers overlook is loading that key with extra keys and bulky keychains. While it may seem harmless, this practice can negatively affect safety, vehicle performance, and even long-term durability.

The additional weight from extra keys puts strain on the ignition cylinder’s internal components. According to automotive experts, including Jake McKenzie, content manager at autoaccessoriesgarage.com, ignition systems are designed to handle only the key itself—not the constant pull and movement of a heavy key ring. Over time, everyday driving vibrations, bumps, and turns cause unnecessary stress, gradually wearing down sensitive internal parts.

Here’s why it’s best to keep your ignition key on its own:

Accelerated Wear
Starting your car activates a precise mechanical process. Extra weight increases the load on the ignition cylinder, speeding up wear and raising the likelihood of expensive repairs or full replacement.

Ignition System Issues
Modern vehicles rely on carefully tuned ignition systems for smooth operation and fuel efficiency. Excess weight can cause misalignment or internal damage, potentially leading to electrical problems or trouble starting the vehicle.

Increased Risk of Ignition Switch Failure
Ignition switches aren’t built to support heavy keychains. Constant swinging and pulling can degrade internal parts, making the key difficult to turn or causing the switch to fail entirely.

Security Risks
Keeping multiple keys together may be convenient, but it also increases risk. If the key ring is lost or stolen, it can grant access not only to your vehicle but also to your home or workplace.

Higher Chance of Key Breakage
A heavier, longer key ring puts extra pressure on the ignition key, increasing the possibility of it breaking off inside the cylinder—a repair that’s both costly and inconvenient.

Less Comfortable Driving Experience
Bulky keys can be awkward to handle, and repeated movement may eventually damage nearby interior components.

Warranty and Insurance Concerns
Some warranties and insurance policies limit modifications or misuse. Damage caused by excessive key weight could jeopardize coverage if ignition-related problems occur.