Replacing the spark plugs on Peugeot 3008 - 5008 phase 1 and 2, Citroën C5 Aircross, Opel Grandland, and all vehicles equipped with the EP6 THP engine.

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  • OVERALL DIFFICULTY INDEX: 2/10
  • IF YOU HAVE NO TOOLS, YOU PAY $35 TO GET THEM FOR THIS JOB
  • IF YOU HAVE NO EXPERIENCE YOU SPEND 30 MINUTES TO CARRY OUT THIS JOB
  • RISK OF HAND INJURY, SEE BELOW
BEFORE YOU START
  • Your engine should be cold for this intervention. Do not attempt to work on a hot engine.
  • Watch out when unscrewing the spark plugs, they could loosen suddenly sending your hand onto a hard or sharp surface resulting in an injury.​
DISCLAIMER:
Our pictorials are of informative nature and do illustrate works carried  out by ourselves at our own premises for our own use and satisfaction.
Readers who envisage to carry out similar works inspired by the below method shall do this at their own risks and liability.
The below works concerned a Peugeot 5008 equipped with a turbo-charged PSA BMW EP6 engine.
Same or similar engine and turbos can be found on Peugeot 207, 208, 308, 508, 3008, 5008 and Citroen C4, C4 Sedan, DS3, DS4, DS5 also the Mini Cooper S.

Tools needed for the spark plugs replacement on Peugeot 3008 - 5008

You will need a 14mm 12-point socket, see below for buying it from our partners' stores if you don't have one.

Spark plugs removal on Peugeot 3008 and 5008 1.6 THP phases 1 or 2

Without any tool, disconnect the coils and pull them up to extract them from their wells on the cylinder head
Gently introduce the socket with a 20 cm or longer extension, fit the ratchet handle and unscrew all spark plugs.
Use a magnet pick-up tool to take out the spark plugs and keep them in a manner to identify which one was mounted in which cylinder.
Proceed to their inspection as explained below.

Inspecting the spark plugs for early wear or for determining engine condition

Inspect well your spark plugs while keeping them in the same order than your cylinders, for easily identifying a problem at a particular cylinder, if any. Under normal conditions, all your spark plugs should have their electrodes colored in light to dark brown.
If not, click on the below links to see how to diagnose your engine out of the spark plugs.

Spark plugs refitting on Peugeot 3008 - 5008 1.6 THP

Hold the new spark plug with your finger to the wall of its well and let it go down slowly.
Use again the 14mm 12-point socket and extension to tighten the spark plug by hand. Do not use the handle at this stage.
Then use a torque wrench set at 2.5 mKg for tightening the spark plugs.
If you have no torque wrench, tighten by 1/8th of a turn after firm contact.
Apply one coat of silicone dielectric grease to the boots of the COP's before refitting them. See our specific tip for preventing high voltage leaks from EP6 engine coils.

See also our other tutorials in relation with car ignition systems...

Spark plugs for Peugeot 3008 / 5008 you can buy from our partners' store, always make sure of the compatibility with your vehicle: