How Long Do Ignition Coils Last? (Explained!)

The ignition coil will serve as an induction coil, and it will convert the twelve (12) volts of the vehicle into a lot more because it is the requirement for the jump of the spark plug gap and ignite the air-fuel mixture of an engine. So what is the lifespan of these ignition coils? Let us find out.

So how long do ignition coils last? The ignition coil in your vehicle is known to last for around one hundred thousand (100,000) miles.

There is a combustion process that happens in your vehicle. This combustion process will happen if your vehicle is cranked, and it is essential so that your vehicle will start and then move. 

To get your vehicle moving, you need the help of many different components in your vehicle. And these different components in your vehicle involve the ignition coils. When you turn the key on your ignition, that is the time when the ignition coil will make a spark, and that spark will be able to ignite the air mixture and the fuel in your vehicle’s engine. 

So that is why it is essential to keep your ignition coil as good as new. So now, let us talk further about how long these ignition coils last. Let us start.

How Long Do Ignition Coils Last

How Often Should Ignition Coils Be Replaced?

It is said that the ignition coil in your car can last for about one hundred thousand (100,000) miles. However, it’s not required for you to replace your ignition coils after reaching one hundred thousand (100,000) miles. You can change your ignition coils before then. 

It is not only the mileage that you have to consider when changing your ignition coils. You should also check for the physical appearance of the ignition coils. You should also check for the performance of your car. 

Some other factors will help you decide when to replace your ignition coils. So if your ignition coils are not in their best condition even before reaching that one hundred thousand (100,000) miles mark, you can always change and replace them at that given moment.

How Many Years Do Ignition Coils Last?

According to Federal Law in the United States, the ignition coil and the vehicle’s ignition module are about two (2) years. That is a good number because the ignition coil will then start wearing off at that time. 

Over time, the insulation that is in the ignition coil will then be degraded over time. Therefore, in two (2) years, the ignition coil will start to wear out, and they will need their replacement as soon as possible.

How Many Miles Do Ignition Coils Last?

The ignition coils can last for as long as one hundred thousand (100,000) miles. But, of course, by then, the ignition coils will then start to degrade, so that is when you already have to replace the ignition coils. 

Not replacing your ignition coils can affect your engine’s performance. However, you should change it by then so that your vehicle’s performance will not be compromised.

Should I Replace All Ignition Coils At Once?

No, you do not have to replace all the ignition coils in your vehicle. Instead, you have to change the one that is damaged.

What Are The Symptoms Of A Bad Ignition Coil?

If you are experiencing that your vehicle is not driving smoothly and behaving rather oddly, then there can be some problems with your ignition coils. First, of course, you have to check with your other components if any other damages aside from the ignition coil. 

If there are no other damages to your other vehicle’s components, then you can go and proceed with checking your ignition coils. If you want to know about the symptoms of a bad ignition coil, here they are.

1. You Will Have A Misfire On Your Engine

There will be an engine misfire if your ignition coils are failing. If you start your vehicle and you have a failing ignition coil, that is the time when you will feel that your engine is coughing and it has a sputtering noise. 

You can also notice this when you are driving. For example, if you are speeding up, your vehicle might jerk or spit some noise.

2. You Will Have A Poor Fuel Economy

You also have to observe if you have a poor fuel economy. If you have poor fuel economy, then you might be having problems with your ignition coils. 

Notice how much fuel you are consuming. If you observe a decrease in your fuel economy performance, you might be suffering from bad ignition coils.

3. You Might Experience A Rough Idle

You also have to notice if your engine is having a rough idle. You might feel that your engine is losing power. If your car is idling, you may feel that it is uncomfortable and that you might be feeling that your vehicle is losing its power. 

If you are experiencing these, have your ignition coils checked and have them repaired. Then, replace it if necessary so that your problems will be fixed.

4. You Will Have A Stalling Of Your Vehicle

If your ignition coil is failing, it can also lead to a stalling of your vehicle. The engine stalling is happening because your failed ignition coils send irregular sparks into your spark plugs. If you are experiencing this, your vehicle might be suffering from bad or failing ignition coils.

5. There Will Be Backfiring

If you notice that your vehicle is backfiring, it can be one of the symptoms of an ignition coil problem. This symptom can be found early in the problem with ignition coils. 

If there is fuel in your combustion cylinders and it is not being used, it will leave through the exhaust pipe. Do not let this problem unsolved because if you allow this problem to go big, you might have to pay for a huge repair cost.


In summary, the ignition coil is part of the process of starting your car and running your car. This is as important as a spark plug. With that, it is also essential to keep your ignition coil in good condition. 

Ignition coils do not last forever, so they need to be replaced. However, they can last for about one hundred thousand (100,000) miles.



Image credits – Canva

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My name is Hank, and I've been in the automotive industry for 27 years. I've been working in my own auto repair shop for the last 13 years, and now I want to help you here, on my blog. Let me know if you have any questions. Read more