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How Much Does It Cost To Replace Spark Plugs: 90% Don’t Know

If you are dealing with a faulty spark plug, it is an obvious question, ‘How much does it cost to replace spark plugs?’. The replacement of spark plugs is simple, but people are reluctant to buy a new spark plug to have a perceived notion about its high cost.

An average spark plug costs you $20 to $ 120. There are various factors, such as the model and year of your vehicle, to determine its cost. Also, the quality of the spark plug plays a significant role in deciding its final cost.


Spark Plug For

 Spark Plug Cost

Labour Cost


Mercedes Benz M Class

$68 to $87$350

Toyota Tacoma

$143 to $190$200

Honda Accord

$ 110 to $190$60

Spark plugs are designed to last between 50,000 and 100,000 miles. Replacing them every five years should ensure that your vehicle runs smoothly for decades.

Spark Plug Replacement – Is it Essential?

Modern vehicles have an electric starter motor that turns the crankshaft when you turn the key. Spark plugs get their energy from a battery pack located under the hood. These batteries must be charged before driving away and will run down if left idle.

If the spark plug is not faulty, other possible components that may need a replacement include a spark plug wire harness, oxygen sensor, air filter, PCV valve, fuel filter, and spark plug wires. If you drive your vehicle regularly, you should replace the spark plugs every 30,000 miles.

If you drive less frequently, you should replace them after about 50,000 miles. Platinum-coated spark plugs last longer and requires fewer replacement cycles.

What is the Average Cost of Replacement for Spark Plugs?

Spark plug prices vary widely. Generally speaking, the higher the voltage, the lower the resistance, and thus the smaller the current required to produce an arc across the gap. Thus, the cheaper the spark plugs, the greater the voltage required to ignite them. Spark plugs for high-performance cars often cost hundreds of dollars. For example, the replacement of spark plugs for a Ford Mustang GT costs about $350, and the additional cost of labor stands is around $150 leading to a total replacement cost of around $500.

On average, a set of spark plugs ranges from $15 to $50. If you’re looking at buying a set of spark plugs for a car that costs less than $20,000, then you’ll probably get away with just one pair. But if you’re planning to buy a set of spark plugs where the car costs more than $40,000, you may want to consider getting two pairs since you’ll save money by not having to replace the plugs every time you change the spark plugs.

Should I Replace the Spark Plug Wires as well?

It would help if you changed out spark plug wires at the time of replacing the spark plugs. Standard spark plugs last around 40,000 miles, while extended-life spark plugs will increase the life of your spark plugs to 100,000 miles. Changing out the spark plug wires will help prevent damage to the engine caused by corrosion.

Check for any rodents’ cracks, fray, or bites in the wire. A faulty wire turns a suitable spark plug into a bad one, taking a toll on your engine.

Why Should I Replace the Spark Plug at the Earliest?

Spark plugs are an essential component of your vehicle. They help ignite the fuel when starting your car. When spark plugs wear out, they may cause your engine to run poorly or fail altogether. A worn spark plug causes excessive carbon buildup inside the combustion chamber. Over time, this leads to increased cylinder pressure and damage to other engine parts. Replacing a spark plug before it fails is a great way to keep your engine running smoothly. Another important reason you should replace your vehicle’s spark plugs is that you will not get the best fuel efficiency when your spark plugs are not on par with each other.

Should I Replace all the Spark Plugs?

Yes, it is logical to replace all the spark plugs together. The main reason is that if you replace only 1-2 spark plugs at a time, it will take a lot of time and effort to check and identify the faulty spark plugs at the time of the next replacement.

If you have a bad spark plug in two out of four cylinders in your engine while the rest are relatively new, it will cause an imbalance in your engine. Your engine will not run at its peak performance level.

For an optimum car performance level, all the spark plugs must have the same level of performance. Any drop in the performance of a single spark plug will bring down the efficiency of the whole car.

Should I change the Spark Plug or Take the Help of a Professional?

Depending on the location of the spark plug, you may choose to DIY spark plug replacement or take the help of a professional. For example, Removing the spark plugs of the V-65 engine is complicated because they are located very low under the battery.

If your engine gives you easy access to spark plugs, you can consider changing them on your own. It will save you on labor costs. But you have to ensure the correct gapping of the spark plugs. If you are not sure about this, you must seek some professional help to let things fall in the right place.

How Long Does Spark Plug Replacement take?

Many factors affect the time it takes to change your spark plugs. These factors include the car’s make and model, how challenging it is to get to the plugs, how old the vehicle is, and whether or not you need to replace them.

For example, we found that the average time for a Ford Fiesta to change its spark plugs was 1 hour and 10 minutes, while the average time for a BMW 3 Series was 2 hours and 50 minutes.


It is always better to replace the spark plugs before any problem arises. You can do it yourself, but it is recommended to hire a professional mechanic to do so. It will be helpful in case there is any issue during the process.

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My Name is Christopher Angels, and I am a postgraduate in mechanical engineering. Cars have always excited me as a child, and soon I decided to dive into the world of cars by pursuing mechanical engineering. I also worked as a Mechanic for over 3 years to understand Cars' anatomy and how each part contributes to its working.

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