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Total expert spark plug change mechanics

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Total number of spark plug change reviews

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Top Mechanics For Spark Plug Change & Replacements

41 Reviews

Mobile mechanic in Hemel Hempstead, 20 years of experience

Worked in main dealers been self employed for 6 years as mobile mechanic

134 Reviews

Garage in Hull, 15 years of experience

I started my career back in the early 2000's working as a mobile breakdown and recovery technician. Having worked here for a number of years I then worked at several other independent garages. I now work fo...

134 Reviews

Garage in London, 18 years of experience

Our Services​ ​- Complete Computer Diagnostics - Complete Safety Analysis - Rideability Problems - Tune - ups - Oil Changes - Tyres - Brake repair specialist - exhaust systems -Suspensions

10 Reviews

Garage in Bristol , 10 years of experience

My name is Adam, mobile mechanic based in Bristol, I offer roadside assistance where possible - I cover most work types including , plug in diagnostic, pre purchase inspection, servicing and brakes.

3 Reviews

Garage in Headley, 24 years of experience

Hi my name is James. I am a senior technician starting my apprenticeship with BMW and mini 24 years ago. In this time i have worked overseas. Done many training courses including air conditioning, wheel ali...

CLAIRE 15th September 2023

Vauxhall Corsa • Additional work following previous booking

12 Reviews

Garage in Wokingham , 12 years of experience

I am a mechanic in the Wokingham area. I have 12 years of experience and I am always happy to help.

433 Reviews

Garage in Middlesex, 13 years of experience

I have 3 years working for Volkswagen but the bulk of my experience has been with small independent garages working on all makes and models. I have been an independent mechanic for the past 4 years and am ab...

23 Reviews

Garage in England , 18 years of experience

I started my journey into the motor trade 18years ago as a IMI apprentice and working my way up to gain level 3 in BTech then going off to university to study Motor sport engineering. I worked in Main dealer...


15 Reviews

Garage in London , 5 years of experience

I have more then 5 years of work experience with vast makes of vehicles. I am specialized in diagnostic, programing and inspecting and fixing Mechanical components of various vehicles.

29 Reviews

Garage in London, 9 years of experience

Highly skilled Car Mechanic with 9 years of experience in diagnosing, repairing, and maintaining various types of vehicles. Proficient in using a range of tools and equipment to troubleshoot problems and com...

61 Reviews

Garage in Hartcliffe, 5 years of experience

Carbase 2018 - 2022- Technician for 4 year doing various jobs such as major servicing, clutch replacement, cambelt replacement, alternator replacement, suspension replacement, light diagnostics and component...

10 Reviews

Garage in London, 6 years of experience

I have been a vehicle technician for 5 years. My abilities includes: - Working with a range of vehicle makes and models - Carrying out diagnostics and basic electrical diagnostics - Servicing vehicles ...

43 Reviews

Garage in Yapton, 13 years of experience

Here at CK Mobile Mechanics we believe in a no nonsense aproach to vehicle repair and servicing, Keeping downtime to a minimum and keeping your wheels turning. As we offer a fully mobile service, we ...

Frequently asked questions about spark plug change & replacements

Read our answers to questions about spark plug change 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. See the averages for different makes below. We consolidate industry standard data with millions of data points to give you the most accurate price. These estimates may include Spark plug.

Estimates on average repair costs, such as the above results for a spark plug change, are based on ClickMechanic's quote data which combines multiple third-party sources. Actual costs may vary. We provide estimates on average 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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