The check Strap is the part of the door just above the wiring loom that holds your door open.

Before the observant of you tell me the obvious, no this isnt a 6 and no it isnt even a 3 door but Im sure theres not much difference This car is a phase 3 HDi Dturbo 5 door

This is a guide to replacing the whole check strap mechanism. The part I bought from peugeot was already fully assembled. From reading other comments it is possible to buy just the pin or just the plate the strap is pinned to. If you dont need to replace the mechanism you dont need to take the door card off so the job is much easier

So you will need:

10mm socket and rachet
Torx T20 (speakers)
Torx T30 (Door Card)
Small flat screwdriver (for prizing!)
Kitchen Roll (its greasy!)

Optinal Extras:

Door Card clips (cost about 6p each from peugeot)
Replacement Sound proofing (sticky back foam stuff)
Spray paint (if you are anal about having the strap colour coded!)
PTFE (plumbing) Tape (to wrap round the cadr clips)

First we need to get the door card off. Remove the speaker cover (just clipped on) and undo the three T20 torx screws. Unclip the yellow connector on the back of the speaker.

justinaccurate has attached the following image:

Remove the rubber bung from just below the wing mirror blanking plate and remove the T30 screw. (not pictured). The final T30 is in this hole below the handle. A magnetic screwdriver attachment would help but in all honesty the bolt cant drop anywhere apart from out of the car (its not going to vanish into the door card!)

justinaccurate has attached the following image:

Starting where the speaker sits, run your fingers around the edge of the card and use sensible force to pop out the door card clips.

The following two pictures may or may not help you locate them as this is a 4 door but they will give you an idea of where the clips are (white circles in the pictures)

When the card is loosened, gently lift it over the push down door lock. Note how the metal runner sits in the rubber trim.

justinaccurate has attached the following image:

OK so you are ready to remove the old check strap.

It should be held to the car by 2 10mm bolts and to the door by 2 10mm nuts

There is some sound proofing in the way what you have to carefully punch a big hole in with your screwdriver

Removing the mechanism whole is not very easy. The bracket it bolts to the car with is very close to the size of the hole the strap comes through and as you can see the window guide is in the way so you have to twits and turn the damn thing.

Fortunately for me, the bracket was broken so it came out easy.

justinaccurate has attached the following image:

To refit the door card, first line up and lower the door lock button with the hole and lower the metal rail into the rubber guide. You can look at the door release handle and torx screws to line up when it is back in place.

Before you clip anything make sure the electric window wire and speaker wire are visible and pulled though the card!

Inspect the card clips to see if any are damaged, replace if necessary. A 306gti6.com top tip is to wrap the card clips in PTFE tape to help them grip the door and make it less likely they pop out

Push or gently thump the clips back into place

For the rest of the card, "refiting is the reverse of removal" ™

justinaccurate has attached the following image: