Ignition coil replacement

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What is an ignition coil?

ignition coil

An ignition coil - or spark coil - is a piece of metal coil connected directly to the car's spark plug. It is both a small computer and an electrical coil at the same time. But how does an ignition coil work?

When you turn the key in the ignition, a sensor tells the engine control - the car's computer itself - how many revolutions the engine has. This signals to the ignition coil that it must distribute the ignition signal to the spark plugs. An ignition coil is the electrical device that supplies inductional power to the spark plug and so engages the combustion spark.

There may be an ignition coil for each spark plug or a single ignition coil for all. Sometimes, where multiple coils are connected to each of their respective cylinders, a molded block, including high-tension terminals, surrounds the ignition coils. This is called an ignition coil pack. An ignition coil in each spark plug means they are smaller but can read data from valves and spark plugs more easily. This allows them to adjust the current according to the engine speed.

Does your car have ignition coil failure?

There are a number of symptoms of ignition coil failure that you should keep an eye out for or that you may have already noticed:

  • Starting-problems
  • Uneven torque, and the car seems unsteady when idle
  • A lack of traction from the engine

Many people search for "How to test ignition coil". It makes sense to do an ignition coil test if you’re in doubt as to whether something is wrong. Luckily, there are a few ways how to tell if ignition coil is bad. However, we do not recommend that you start an ignition coil test yourself, as the coil is high voltage. It can be very dangerous if you are not experienced with this kind of work.

We therefore strongly recommend that you ask your local mechanic if you have any concerns. If you have a newer, more intelligent car, the mechanic will search for diagnostic trouble codes that reveal which ignition coils are faulty - or if the ignition coil pack is defective. Otherwise, the mechanic will test the actual voltage level in the ignition coil(s) and do an assessment.

What will my ignition coil replacement cost in the UK?

Changing the ignition coil is a very variable job - it all depends on the car, the number of ignition coils, etc. However, you can always see where the ignition coils are when you look under the hood.

The mechanic will remove the wires tied to a distributor, which controls the coils. They can pull out the coils - on some cars, however, they have to be unscrewed. New ignition coils can then be installed in the spark plugs and the distributor.

If you need to replace your car's ignition coil(s), ask for quotes on the job at Autobutler's garages. Our customers save 20-40% by comparing quotes!

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Average cost on engine work

Below you can see the cost for general engine work on selected car brands. Book your pistons work at the mechanic here:

Make Avg. price Min - max
Audi £ 441 £ 72 - £ 960 Get quotes
Citroën £ 669 £ 133 - £ 1,280 Get quotes
Ford £ 414 £ 75 - £ 983 Get quotes
Land Rover £ 436 £ 96 - £ 976 Get quotes
Nissan £ 344 £ 63 - £ 1,068 Get quotes
Peugeot £ 381 £ 60 - £ 1,080 Get quotes
Renault £ 554 £ 75 - £ 1,132 Get quotes
Toyota £ 160 £ 54 - £ 450 Get quotes
Vauxhall £ 346 £ 75 - £ 829 Get quotes
Volkswagen £ 431 £ 75 - £ 840 Get quotes

The prices are based on all quotes sent via autobutler.co.uk, and may contain errors or vary. Please create a job if you would like detailed quotes for your car.

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