Most of us don’t think about our car keys until one stops working, usually when we’re running late. The good news is that car key maintenance is easy, cheap and doesn’t need any special skills. A few small habits can save you from a flat battery, a cracked case or an expensive replacement.
This guide is for beginners. It covers the basics of what’s in your hand and then gives you 10 simple ways to look after it.
First, what kind of key do you have?
Knowing your key type makes everything else easier.
- Standard key: a plain metal key with no electronics.
- Transponder key: a key with a tiny chip inside. Your car won’t start unless it recognises the chip.
- Key fob or remote: the plastic unit that locks and unlocks your car from a distance. It runs on a small battery.
- Flip key: a key blade that folds into a remote body, so you have one tidy unit.
Many modern keys combine two or three of these. If you’re unsure which you have, our team can identify it for you. You can also browse our car remotes and transponder keys service page.
Why car key maintenance matters
A modern car key is a small piece of electronics that gets dropped, sat on, rained on and chewed by pets. Looking after it costs very little. Replacing or reprogramming a lost or damaged key costs far more, and it usually happens at the worst possible time.
1. Change the battery before it dies
A weak battery is the most common reason a fob stops working, so check it first. Consumer Reports notes that fob batteries typically start to weaken after a year or two. The most common fob battery is the CR2032, and a fresh one can last roughly three to four years. Your actual results depend on the car and how often you use the fob.
If you notice the range shrinking or the buttons needing several presses, swap the battery. Don’t wait for a complete failure.
2. Keep your fob away from water
Water is one of the quickest ways to kill a fob. Moisture can damage the internal electronics and stop the fob working altogether. That means no pockets on laundry day, no trips to the pool and no leaving it out in the rain.
If it does get wet:
- Open the case and take the battery out.
- Let the parts air dry separately. A packet of silica gel can help.
- Put everything back together only when it’s completely dry.
Salt water and chemicals can cause lasting damage, so get it checked if your fob still misbehaves.
3. Use a key fob protector
A simple silicone cover is one of the cheapest upgrades you can make. A good key fob protector cushions drops, shields the buttons from wear and scratches, and helps keep dust and splashes out. It also makes your key easier to spot in a bag. Choose one that fits your fob snugly, and check that it doesn’t cover the buttons or trap moisture inside.
4. Store your keys sensibly
Where you keep your keys matters more than you’d think. Consumer Reports advises against leaving a fob in the car overnight or on a hook close to it, because it can keep communicating with the car and drain the battery.
Pick a spot inside the house, away from the car, to keep it as a habit. A bowl or hook by the door works well.
5. Keep them away from heat
Dashboards and hot cars are hard on plastic and electronics. Heat can warp cases, weaken glue and shorten battery life. Take your keys with you rather than leaving them on the seat or dash, especially through an Australian summer.
6. Lighten the keyring
A heavy bunch of keys hanging from your ignition puts constant strain on the key and the ignition barrel. Over time this wears both. Keep only the keys you need on the ring, and remove bulky charms and extra fobs where you can.
7. Clean them gently
Pockets and bags collect lint, dust and grime. Wipe your key with a soft, slightly damp cloth, and use a dry cotton bud around the buttons. Avoid harsh chemicals and never soak the fob. Leave it to dry fully before you use it.
8. Handle with care and check for cracks
Never use your key to pry things open, scrape or open packages, and don’t force a stiff button. Every few months, give your fob a quick check. Look for cracks, loose seams, worn buttons and a battery cover that doesn’t sit tight.
A cracked case doesn’t always mean a dead key. Often the electronics inside are fine and only the housing has failed. That’s when broken car key shell replacement can save you from buying a whole new remote.
9. Keep a spare and test it
A spare key is cheap insurance. Keep it somewhere safe at home, not in the car, and test it every few months. Make sure it still unlocks the doors and starts the engine. A spare that has quietly died in a drawer isn’t much help when you lose the main key. If you need another, see our flip keys, fobs and standard keys page.
10. Keep button batteries away from children
This one matters most. Fobs are small, shiny and easy for kids to grab, and the batteries inside are dangerous if swallowed. The ACCC warns about button batteries in car key remotes, describing them as tempting toys for young children and noting that a swallowed button battery can cause catastrophic injuries in as little as two hours.
Keep keys out of reach and make sure the battery compartment closes securely. If you think a child has swallowed a button battery, seek emergency help straight away. You can also call the Poisons Information Centre on 13 11 26.
When to call in a professional
DIY car key maintenance covers a lot, but some problems need an expert. See a professional if:
- The fob still doesn’t work after a new battery.
- You’ve lost your only key.
- The case is badly cracked or broken.
- The key won’t turn in the ignition or lock.
- You need a spare cut or programmed.
Need a hand with your keys?
If your key or fob is acting up, or you’d like a spare while everything still works, the team at Tornooke Keys can help. Visit us at Shop 83A, Westfield Shopping Centre, Mount Druitt NSW 2770, call +61 421 661 176, or explore our car remotes and transponder keys services to see what we can do for you.
