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If the faulty sensor is one of the inner sensors the bumper has to come of. If it is a outer sensor only half the bolts on that side have to be removed. Start by partly removeing the under wing shield and there is access to the bolts,open the boot remove plastic shut trim and more bolts. Pull back side carpets remove the black side plates to get to more bolts remove bumper and replace the faulty sensor leave the bumper connected and pointing away and test before refitting.
remove rear mudflaps if fitted, remove screws from rear of wheel arch liners. two 19mm headed bolts from underside of bumper, be warned they sieze and a lot of force will destroy the bumper mounts and the bumper beam not cheap to repair.
disconnect the connector from the park aid module push the connector and grommet out of the back panel remove screws from lower rear of wheel arch liners remove boot floor trim remove plastic boot closing panel trim remove both boot side trims you wil find a number of 10mm headed bolts around the boot at the sides and back remove these and get someone to help you remove the bumper liner the 2 outer sensors can normally be changed without removing the bumper liner on some models
Open the bonet and look directly behind the headlamp and you should see a black plastic cover with 2 steel clips holding it onto the headlamp. Push the clips to the side and remove the cover. Do not remove completley as it will be difficult to refit. Just so you can get you hand to remove the connector. Remove and replace bulb
Front bumper removal is quite easy. To start with there is 4 10mm bolts one by each headlamp ( with the bonnet open) remov them. There is 3 T30 screws that hold the under tray to the subframe and there is also a small corner trim that is on the bumper side of the front wheel arch here is 3 T30 screws holding them on on each side. Finally remove the front wheel arch lining so you can get acsess to the inside of the bumper. You will then see a 10mm bolt towards the top of the bumper that is reversed to you. Remove then the bumper should then just pull away.
Becareful not to damage the fog lamp harness upon removal
do you know what H type of bulbs you have? some are just a twist other have a clip that needs to be pressed and let fold down to allow bulb removal.
in the engine comartment behind where the headlight are there are either rubber boots or clips that need to be removed to expose the back on the buld. remove the retaining clip as mentioned above or gently twist he bulb to remove it. now remove the old bulb from its holding wire.
when inserting the new bulb do not touch the glass as oil from the skin and disrupt its performance. reverse the removal process and do the same on the other side.
NOTE: the new bulbs elements are in a slightly different postion in the bulb than the old ones (no two bulbs are exactly alike) for best visibilty have you headlight realligned after bulb replacement.