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Spark Plugs

Spark Plugs
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  1. Bosch +8,FR7DC+,S8-4 0242235912 Spark Plug Ignition Super Plus
    £7.62 £6.35
  2. Bosch +9,FLR8LDCU+ 0242229878 Spark Plug Ignition Super Plus
    £10.14 £8.45
  3. Bosch AR5SII3320S 0242145573 Spark Plug Ignition Double Iridium
    £10.94 £9.12
  4. Bosch FQR8LEU2 0242230806 Spark Plug Ignition Super
    £14.42 £12.02
  5. Bosch FR78NX 0242232815 Spark Plug Ignition Super 4
    £16.09 £13.41
  6. Bosch FR7DCX+ 0242235913 Spark Plug Ignition Super Plus
    £6.27 £5.22
  7. Bosch FR7DII35X 0242236642 Spark Plug Double Iridium Replaces
    £13.72 £11.43
  8. Bosch FR7KII33T 0242236595 Spark Plug Ignition Double Iridium
    £4.48 £3.73
  9. Bosch FR7KII35T 0242236670 Spark Plug Ignition Double Iridium
    £12.05 £10.04
  10. Bosch FR7LCX+ 0242235986 Spark Plug Ignition Super Plus
    £7.89 £6.57
  11. Bosch FR7LDC+ 0242235914 Spark Plug Ignition Super Plus
    £8.56 £7.13
  12. Bosch FR8DII33X 0242230534 Spark Plug Ignition Double Iridium
    £6.39 £5.32
  13. Bosch FR8DPP33+ 0242229925 Spark Plug Ignition Double Platinum
    £21.68 £18.07
  14. Bosch FR8NII35T 0242230610 Spark Plug Ignition Double Iridium
    £12.05 £10.04
  15. Bosch FR8SC+ 0242229923 Spark Plug Ignition Super Plus
    £9.60 £8.00
  16. Bosch FR8SC+ 0242229995 Spark Plug Ignition Super Plus
    £7.02 £5.85
  17. Bosch FR91X 0242222804 Spark Plug Ignition Super 4
    £13.35 £11.12
  18. Bosch HR78NX 0242232814 Spark Plug Ignition Super 4
    £16.71 £13.92
  19. Bosch HR7DCX+ 0242235979 Spark Plug Ignition Super Plus
    £7.91 £6.59
  20. Bosch HR7MII30T 0242236678 Spark Plug Ignition Double Iridium
    £9.21 £7.67
  21. Bosch HR7NII332S 0242236675 Spark Plug Ignition Double Iridium
    £9.95 £8.29
  22. Bosch HR8LII33U 0242230523 Spark Plug Ignition Double Iridium
    £7.27 £6.06
  23. Bosch VR6NII332 0242140557 Spark Plug Ignition Double Iridium
    £9.95 £8.29
  24. Bosch VR7MII33U 0242135569 Spark Plug Ignition Double Iridium
    £10.67 £8.89
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Spark Plugs

Spark plugs create the current that ignites your fuel-air mixture.  Without them, nothing would happen when you turn the engine on and you would be marooned.

In each cylinder head of your petrol engine, electrodes in your spark plugs connect to the ignition coil/distributor through an ignition cable, creating a spark of at least 20,000 volts.

Glow plugs are the equivalent car parts for diesel engines.  While diesel combusts with hot, high-pressure air, petrol combusts with a spark.

Spark plugs should be replaced at every service.  Different engines require different types and quantities.  To identify the necessary replacements for your vehicle, enter your car details into our car part finder.

 

How do I know that my spark plugs need to be replaced?

  • Acceleration is poor.
  • Spark plug surfaces are worn.
  • The insulator is cracked.
  • Engine start is hindered.
  • Your engine vibrates during driving, even more so at idle.
  • Your vehicle’s power capacity is reduced.
  • Your fuel consumption has increased.
  • There is increased carbon monoxide in your exhaust gas.

 

Why do my spark plugs need to be replaced?

  • There is soot on the spark plug electrodes.
  • The piston rings are worn.
  • Your cooling system water pump is damaged.
  • An incorrect operating temperature has been selected for your spark plugs.

 

How do I replace my spark plugs?

Spark plugs can’t be repaired, but they can be replaced without any technical expertise. 

Locate your spark plugs under the bonnet; they may be concealed beneath an engine cover.   Wait until the engine is cold and disconnect each ignition wire.  Use a ratchet to remove the spark plugs.  Lubricate your replacements and connect them to the ignition wires using the ratchet, referring to your car owner maintenance manual to check your required spark gap.

Spark plug brands stocked by DIY Car Service Parts