Emergencies
Car Key Replacement and Car Lockouts: A Sydney Driver's Guide
Locked out of your car or lost the only key? What to do first, how car keys and remotes work, what replacement involves and when you need a dealer instead.
8 min read
Few things ruin a day faster than standing beside your car with the keys sitting on the driver's seat, or patting every pocket and realising the only key is gone. Car lockouts and lost car keys are some of the most common calls we take, especially around Moore Park on event days, outside gyms and supermarkets, and in the tight streets of Surry Hills and Darlinghurst.
This guide explains what to do first, how modern car keys work, what replacing a key involves and when a dealer is the better option. For service details, see our automotive locksmith page.
First, check that everyone is safe
Before anything else:
- If a child, a vulnerable person or a pet is locked inside the car, call 000 immediately. Cars heat up very quickly in Sydney, even on mild days. Emergency services will act faster than any locksmith can.
- If you feel unsafe where you are, move to a well-lit public place, a shop or a venue with staff, and call from there.
- If the car is in a dangerous position, such as a traffic lane, put your hazard lights on if you can and contact the police or your roadside assistance provider.
Only once everyone is safe should you think about getting back into the car.
What to do if you are locked out of your car
- Check every door and the boot. It sounds obvious, but a rear door or the boot is sometimes unlocked.
- Look for a spare key. A partner, flatmate or family member may have one and be closer than you think. A taxi or rideshare to fetch a spare is often cheaper than a call-out.
- Check your roadside assistance cover. Many memberships, and some insurance policies and new car warranties, include lockout help.
- Find your ID and proof of ownership. We will need to confirm the car is yours. A driver licence plus registration papers, or an app showing the registration in your name, is ideal. If your documents are inside the car, tell us; we can check them once the door is open.
- Call us on 02 3820 5414. Tell us the make, model and year, where the car is parked and where the keys are, if you know.
We open cars using tools designed for the job, aiming for no damage to the door, the seals or the paint. We do not explain how to open a car without a key, and we will not open a car unless we are satisfied it belongs to the person asking.
Keys locked in the boot
Keys locked in the boot are a special case. Many cars lock the boot automatically, and on some models opening a door does not release it. In most cases we open a door first, then use the boot release inside the cabin or the back seat fold to reach the boot. On some vehicles we need to open the boot lock directly. We will explain the approach before we start.
How modern car keys work
Car keys have changed a great deal over the past twenty-five years. Knowing which type you have helps you understand what replacement involves.
Basic mechanical keys
Older cars use a simple metal key with cuts along the blade. A locksmith can cut a new one from the lock or from the key code. These are the simplest and cheapest to replace.
Transponder keys
From the late 1990s, most cars sold in Australia use a transponder key. A small chip in the head of the key talks to the car's immobiliser. Even if the blade is cut correctly, the car will not start unless the chip is recognised. Replacing a transponder key means cutting the blade and programming the chip to the car.
Remote keys and flip keys
Remote keys combine a transponder, a blade and buttons that lock and unlock the doors. The remote and the immobiliser chip may need to be programmed separately.
Proximity and smart keys
Many newer cars use a proximity key that never leaves your pocket. The car detects the key nearby and lets you unlock and start with a button. These keys usually include a hidden emergency blade for the door. Replacing them requires specialised programming equipment, and on some makes only the dealer can do it.
Laser-cut keys
Some keys have a groove cut along the face of the blade instead of notches along the edge. They need a specific cutting machine. We can cut many of these on site.
What replacing a lost car key involves
When every key is lost, the process usually looks like this:
- Confirm ownership. We check ID and registration before starting.
- Identify the key. Make, model, year and sometimes the vehicle identification number tell us which key and chip the car uses.
- Open the car if needed. If the car is locked, we open it first.
- Cut the blade. We cut the key from the lock or from a code.
- Program the key. We connect our programming equipment to the car and add the new key to the immobiliser and, if relevant, the remote locking.
- Test everything. We check that the key opens the doors and boot, the remote works and the engine starts.
Where the hardware allows, it is wise to remove the lost key from the car's memory at the same time, so that if someone finds it, it will no longer start the car.
When a dealer is the better option
We are honest about what we can and cannot do. Some situations need a dealer:
- Some European and luxury makes lock key programming to dealer systems.
- Very new models may not yet be supported by independent programming equipment.
- Damaged or faulty immobilisers or ignition systems may need dealer diagnosis.
- Warranty conditions may require dealer work in some cases.
When you call, give us the make, model and year. If we cannot help, we will tell you on the phone rather than travelling to find out.
Getting a spare before you need one
The cheapest time to get a car key is while you still have one that works. Copying a working key is simpler than creating one from nothing, because we can read the existing key and the car is already unlocked and accessible.
- If you only have one key, get a spare made now.
- Keep the spare at home, not in the car or the glovebox.
- Label it so you know which car it belongs to if you have more than one.
- Replace remote batteries before they go completely flat. A weak battery is the most common cause of a remote that "suddenly stopped working".
Broken keys, worn keys and ignition problems
A key that snaps
Keys snap most often when they are worn or used as a lever. If a key snaps in the door or ignition, do not try to pull the broken piece out with tweezers or a knife. You may push it further in. Call us; we can usually extract it and cut a new key.
A worn key
Old keys wear until they no longer turn smoothly. If your key only works when you jiggle it, have a new one cut from the code before it fails completely.
An ignition that will not turn
If the key goes in but will not turn, check that the steering wheel lock is not engaged. Turn the wheel gently while turning the key. If that does not help, the ignition barrel or the key may be worn and need attention.
Car security habits in the inner city
Inner Sydney streets are busy, and parked cars are a target for opportunistic theft.
- Never leave keys in the car, even for a moment while you drop something off.
- Do not leave valuables visible, including bags, phones, laptops and loose change.
- Lock the car and check it before walking away. Remote locking can be blocked by interference.
- Store keys away from the front door at home. Some vehicle thefts begin with keys taken from a hall table.
- Keep proximity keys in a signal-blocking pouch if your car is vulnerable to relay attacks, and ask your dealer whether a software update is available.
Typical car key jobs, step by step
Locked out outside a gym
A driver locks their keys inside while carrying gym gear. After checking their licence and the registration in their phone app, we open the car without damage. The whole visit takes a short time once we arrive.
Lost the only key at the park
A family loses their only remote key on the field at Moore Park. We open the car, cut a new key, program it and the remote, and remove the lost key from the car's memory.
A remote that stopped working
A driver's remote stops locking the car. We replace the battery and check the remote. It works again, and no new key is needed.
Questions we are often asked
How much does a car key cost?
It depends on the type of key, the make and model and whether you have a working key to copy. A basic mechanical key is inexpensive; a smart key costs considerably more. We give a clear price on the phone before we travel. Our guide to locksmith costs in Surry Hills and Sydney explains what affects the price.
Will opening my car damage it?
Our aim is always no damage. We use tools made for opening vehicles and work carefully around seals and paint.
Can you make a key without the original?
For many cars, yes, by cutting from the lock or a code and programming a new chip. Some makes require a dealer.
Do you come to me?
Yes. Our automotive work is mobile across Surry Hills, Darlinghurst, Redfern, Paddington, Woolloomooloo and Moore Park.
What hours do you work?
We are open 7 days, 7:00am to 12:00am. See our guide to an emergency locksmith lockout in Surry Hills for advice on home and apartment lockouts as well.
The bottom line
If you are locked out of your car, make sure everyone is safe first, check for a spare and your roadside cover, and have ID ready. If you have lost your only key, a mobile locksmith can often cut and program a new one where the car is parked, and remove the lost key from its memory. The best protection is a spare key, kept at home, made while you still have a working original.
For car lockouts and car key replacement, call Surry Hills Locksmith Service on 02 3820 5414, open 7 days, 7:00am to 12:00am, or request a quote.
- Emergencies
- Automotive
- Car keys