The ignition switch is the first step to making a car run. The ignition system sends a signal to various parts of your car, including the computer system, starter relay and fuel injectors. These systems can then start the processes required to fire up the engine.
In addition, ignition systems contain security and theft protection measures. These are electrical signals between the key, ignition switch and onboard computer that confirm the key hasn't been cut or duplicated.

If your ignition switch fails, you won't be able to start your car and will need to replace it immediately for your car to run. In addition to the engine not starting, you might notice other signs of a failing ignition switch, including:

• Flickering dashboard lights or other electrical issues.
• Engine stalling after starting. If the engine starts but then stalls, it may be a sign that your car's security system doesn't recognize the key.
• Difficulty turning the key.
• Engine stalling while driving. If your car stops after bumps or turning the steering wheel, you may have an ignition switch issue.

Overall, having an ignition switch fail is fairly rare. If you notice issues like your car not turning over, you may want to rule out other causes first, like a dying battery or starter.

Replacing a vehicle's ignition switch generally costs around $200 . The amount can be cheaper or pricier (up to $500 or more) depending on your vehicle and ignition system, the specific part needing replacement and whether you hire a professional or repair it yourself.

Traditional ignition switches and push-to-start systems are generally comparable in price. For example, a replacement push-to-start button for a Honda Accord costs about $25, and an entire push-to-start ignition kit costs about $140.
Keyless ignition systems with advanced security systems will be much more expensive, costing thousands of dollars. For example, RFID keyless ignition systems, which use radio signals to prevent theft, can run from $1,100 to $2,000.

On average, replacing an ignition switch costs between $200 and $240. However, there's a lot of variation in what you may pay, and it can easily add up to $500 or more. Here's what can impact the cost of replacing an ignition switch or ignition system.

The type of car you drive plays a huge role in the cost of a replacement ignition switch. Some cars have straightforward ignition switches with few security bells and whistles, and these are usually more affordable. For example, a replacement switch for a Honda Accord costs about $58 to $74. Larger vehicles and luxury cars tend to have more expensive ignition switches. These vehicles often have enhanced security systems and more elaborate ignition systems. For example, a replacement ignition switch that fits an Audi A5, S5 or Q5 costs about $173.

If you purchase parts directly from a car's manufacturer (known as "original equipment manufacturer" or OEM parts), you'll pay a premium. Buying a new ignition switch from an aftermarket manufacturer will likely save you a few dollars.
Since the ignition switch works closely with your vehicle's security and computer systems, talk with your mechanic about the benefits and risks of aftermarket parts. It's possible that using OEM parts will give you peace of mind. There are many great options for aftermarket parts, but be sure to choose a brand known to be reliable and durable. Otherwise, you may find yourself replacing your ignition switch again, sooner rather than later.

Labor for having your ignition switch replaced by a mechanic is generally about $100. Of course, that amount will vary based on your vehicle, location, the security systems included in the ignition system and other factors. In addition, labor costs may be higher if you have a mechanic diagnose the issue. Diagnostics generally add between $90 and $110 to your mechanic's bill.

If you're handy, you can save on labor costs by replacing the ignition switch yourself. This is a DIY job most beginners can handle, but you need to be comfortable working with wires and electricity.
The first step is to purchase an ignition switch replacement kit for your make and model of vehicle. In addition to the kit, you'll need:

• A socket set
• A ratchet set
• A Phillips screwdriver
• A flathead screwdriver
• Electrical tape
• Wire connectors
• A crimping tool

Before you get started, disconnect the car's battery to reduce your risk of being shocked. Then, follow these steps:

• Carefully remove the old ignition switch. Be sure to keep track of any screws and avoid damaging wires. Preserve any sensors that need to be transferred to the new switch.
• Install the new switch. Follow the instructions on the kit. Attach any security sensors to the new switch.
• Test the fix. Switch on the battery, then test whether the switch works.

If your vehicle has an advanced security system, you may need to reset the immobilizer—an electronic system that prevents the engine from starting if theft is suspected. You can't DIY this part; you have to call a locksmith or dealership. Your owner's manual should say whether your car has an immobilizer.

In order to keep your car rolling, it's important to replace an ignition switch or ignition system as soon as you notice trouble. If your car won't start, it keeps stalling or you're having trouble turning the key, it might be time for a new ignition switch. Changing the system yourself or using aftermarket parts can help reduce costs, but you should still plan on spending a few hundred dollars for a new ignition switch—especially one with advanced anti-theft security measures. The peace of mind from knowing your car will start when you need it to is well worth the cost.

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