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Want to learn more about Spark Plug changes?

Read our short guide with information on costs, symptoms and more.

What does a spark plug do?

The engine's spark plugs provide the spark in the combustion chamber to detonate the fuel and air mixture in order to force the piston back down and thereby rotate the crankshaft.

What does a spark plug replacement involve?

  • Mechanic will read the ECU for possible fault codes related to the ignition system.
  • Mechanic will inspect the ignition system and spark plugs.
  • If necessary, the mechanic will replace the full set of spark plugs
  • Mechanic will advise if any other parts need to be replaced.
  • Mechanic will check if the ignition system works correctly again and will test drive the car.

Can I replace spark plugs on my own?

Unless you are a qualified mechanic with the required skills, training and equipment to do the job, we strongly recommend a spark plugs change is only carried out by a professional mechanic. ClickMechanic can help get you a vetted and local mechanic to carry out the work. Just enter your postcode and your car's registration number at the top of this page and select the work needed to get an instant fixed price up front.

What are the symptoms of bad spark plugs?

The main symptoms that can occur when there is a faulty spark plug are;

  • When starting the car is problematic.
  • When the engine cuts out after starting.
  • When the engine does not run smoothly (the engine misfires).
  • When the car vibrates excessively.
  • When the 'Check Engine' light on the car's dashboard is on.

How long will a spark plugs change take?

On average a spark plugs change will usually take 1 hour, but can take anywhere from under 1 hour to 1.5 hours. The time that the job takes will depend on a range of factors. For example, your vehicle's make and model, year, as well as other factors. Select your car at the top of this page for information on job time and cost for your vehicle through ClickMechanic.

How often should you change spark plugs?

Spark plugs are critical to the smooth running of an engine. Without them, the engine will simply not work as it should, if at all. Therefore as soon as you are advised that the spark plugs need changing, you should do so. Running an engine with a faulty spark plug can also cause additional wear and tear on other items.

Spark plugs are always replaced as a set and not done individually.

How can I extend the life of my spark plugs?

The only thing you can do in reality is to use good fuel as this will improve the combustion and prevent the build up of deposits.

Manufacturers service schedules for spark plug changes should be adhered to all tie to prevent issues from arising with older plugs.

Can you drive with a bad spark plug?

If you suspect there is any issue with a spark plug or if there are concerns about its age or condition, book with a professional mechanic as soon as possible to get it checked and replaced if necessary, driving the vehicle may lead to further complications. Bad spark plugs can cause engine misfires and lead to potential engine damage and overheating of the catalytic converter.

What do spark plugs do?

Spark plugs are used to create a spark that ignites the air-fuel mixture in the engine's cylinders, which in turn powers the engine.

What type of spark plugs do I need for my car?

The type of spark plugs you need for your car depends on the make, model, and year of your vehicle. This information can usually be found in the owner's manual or by using online part finders such as Bosch Aftermarket and NGK part finder. You can also input your reg number and postcode on our website and we'll get you a price for the correct spark plugs replacement for your vehicle.

What happens if I don't replace spark plugs?

If you don't replace spark plugs periodically, they will eventually wear out and will no longer be able to create the spark necessary to ignite the air / fuel mixture in the engine. This will cause the engine to misfire, lead to poor fuel economy and in some cases the car may not start at all.

When spark plugs are faulty they can cause damage to the catalytic converter as well, and lead to an increase in harmful emissions.

How long can you drive with faulty spark plugs?

While you are technically able to drive a few thousand miles with faulty spark plugs they can cause multitude of problems such as poor fuel economy, reduced performance and even damage to the engine. It is highly recommended to get them replaced as soon as possible.

Should I replace all spark plugs at the same time?

It's generally advisable to replace all of the spark plugs at the same time since they will most likely have the same amount of wear. This also helps ensure that all of the spark plugs are firing as they should together, which can help improve engine performance considerably.

Does replacing spark plugs improve performance?

Replacing spark plugs does improve performance. New spark plugs can improve the performance of your car’s engine by up to 30% as suggested by the National Institute for Automotive Service Excellence. This is because fresh spark plugs help improve the combustion cycle of the engine, which makes your car’s engine more efficient.

Can you change the spark plugs without changing the wires?

Yes, you can change spark plugs without changing the wires, but it's not recommended. Over time, spark plug wires wear out and become less effective at conducting electricity. This can cause engine misfires.

Are faulty spark plugs an MOT failure?

Faulty spark plugs may cause an MOT failure if the engine is not running smoothly, or if the spark plugs are excessively worn. If you suspect the spark plugs may be faulty, it is best to get them all replaced before the MOT test.

How much does it cost to get spark plugs and wires changed?

On average a spark plug change costs around £85. Depending on the damage caused to the wires, they will also need to replaced which bring the average total cost to about £100. As this cost will change depending on the make and model of the car, you can get an exact price for your car by entering your postcode and vehicle registration number at the top of the page.

What happens if I don't replace spark plugs?

If you don't replace spark plugs, the vehicle will eventually have starting and performance problems. The engine will run less efficiently, and it may be difficult to start the vehicle. In a worst-case scenario you can even expect the car to not start at all.

Is it worth buying expensive spark plugs?

Whether it's worth buying expensive spark plugs will often depend on the type of metal used to manufacture the spark plugs.

Currently iridium spark plugs are the most expensive on the market as they're made of rare earth metal. Iridium plugs typically last longer, have a higher melting point, and create a more powerful spark. This means they help your car’s engine run better, and they last longer.

In fact, many iridium plugs come with a 20,000-mile guarantee, which means you can often go years without changing your plugs.

How much does it cost to have your spark plugs changed?

On average a spark plug change costs around £85. Typical prices can range anywhere from £55 to £125. Ultimately, the cost depends on your car and what parts your car's manufacturer recommends using for the replacement. Find out what you could save by having the spark plugs replaced by ClickMechanic by selecting your car at the top of this page!

Check out the ClickMechanic price for a spark plug change, and find out what you would pay at a franchise dealer. We use industry standard data & millions of data points so you know what you should be paying. These estimates may include Spark plug. We have spark plug change prices for 48 different manufacturers.

Name ClickMechanic Click Mechanic average Franchise dealer estimate

Alfa Romeo

£92 £84 - £185 Get exact price

Aston Martin

£194 £311 - £311 Get exact price


£111 £113 - £189 Get exact price


£222 £287 - £351 Get exact price


£111 £133 - £195 Get exact price


£110 £205 - £205 Get exact price


£75 £63 - £168 Get exact price


£100 £107 - £196 Get exact price


£89 £78 - £182 Get exact price


£68 £73 - £180 Get exact price


£59 £55 - £152 Get exact price


£83 £132 - £152 Get exact price


£182 £125 - £478 Get exact price


£88 £157 - £162 Get exact price


£145 £225 - £225 Get exact price


£81 £81 - £167 Get exact price


£74 £77 - £152 Get exact price


£93 £74 - £194 Get exact price


£91 £80 - £176 Get exact price


£170 £204 - £348 Get exact price


£115 £90 - £221 Get exact price


£74 £73 - £144 Get exact price

Land Rover

£163 £107 - £265 Get exact price


£183 £181 - £390 Get exact price


£220 £332 - £332 Get exact price


£128 £91 - £331 Get exact price


£119 £119 - £211 Get exact price


£99 £96 - £181 Get exact price


£105 £113 - £196 Get exact price


£103 £108 - £189 Get exact price


£117 £103 - £227 Get exact price


£82 £69 - £181 Get exact price

Peugeot Talbot

£75 £94 - £125 Get exact price


£184 £164 - £325 Get exact price


£70 £69 - £165 Get exact price


£82 £72 - £175 Get exact price


£91 £113 - £193 Get exact price


£75 £75 - £159 Get exact price


£87 £101 - £175 Get exact price


£93 £90 - £184 Get exact price


£73 £77 - £165 Get exact price


£343 £459 - £459 Get exact price


£97 £122 - £176 Get exact price


£104 £121 - £195 Get exact price


£94 £80 - £180 Get exact price


£77 £79 - £164 Get exact price


£98 £107 - £182 Get exact price


£95 £94 - £174 Get exact price

Prices could not be created for 33 models. Show ∨

  • Microcar
  • Metrocab
  • Hummer
  • Reva
  • Asia
  • TVR
  • Morgan
  • Buick
  • Lamborghini
  • Pontiac
  • Carbodies
  • Mitsubishi Fuso
  • Moskvich
  • LDV
  • Ford US
  • Aixam
  • Austin
  • Daimler
  • FSO
  • Iveco
  • Maybach
  • Rolls-Royce
  • Santana
  • Tata
  • Great Wall
  • Piaggio
  • Perodua
  • Infiniti
  • Isuzu
  • Lada
  • Lancia
  • Lotus
  • London Taxi's International

Estimates on repair costs, such as the above results for a spark plug change, are created by combining data from multiple third-party sources. The actual cost of using your local repair providers may be outside of the estimated range. We provide estimates on repair costs for information only and accept no liability for any inaccuracies or errors. If you think an estimate is incorrect, please contact us to let us know.

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Recent Spark Plug change quotes

These recent quotes were taken from our quote engine which uses third-party industry standard data on repair times, along with a live parts retailer, and a regional labour rate to build an accurate free quote. We are constantly improving our quote engine, so please let us know if a price seems incorrect.


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