AUDI Q7 EXTERIOR MIRROR MOUNTING ELECTRIC 4M2857409G9B9 GENUINE

Part number 4M2857409G. We take parts off vehicles every week, and this page is updated with a link straight to the part as soon as another one arrives.

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About part number 4M2857409G

An exterior mirror mounting forms the structural frame and pivot mechanism for an wing mirror assembly. It attaches directly to the door structure and houses the internal electric motors that adjust the glass position and power-fold the housing. When this component is working correctly, the door mirror remains steady at speed and adjusts smoothly at the touch of the interior controls.

To confirm that this part is correct for your vehicle, you must check the part number stamped on your original unit against 4M2857409G. On an exterior mirror mounting, this original manufacturer reference is typically molded into the plastic base plate or stamped onto the metal hinge bracket behind the trim cover. Matching this exact number is the only way to ensure the electrical plug and mounting points will fit.

Mechanics usually replace this mounting after a side impact damages the internal cast metal or plastic frame, or when the electric folding mechanism fails. When fitting a replacement mounting, you may also need replacement door trim clips, the outer mirror cover, or replacement mirror glass if the original housing suffered impact damage during the original failure.

About this kind of part: brackets and mountings

A bracket is the moulded or pressed part that holds a panel, a lamp or a bumper to the body of the car. It is hidden once everything is assembled, and it is designed to break: the bracket is cheap and the panel it carries is not, so in a light knock the bracket gives way first and takes the energy. That is why a car with no visible damage often still needs them, and why they are replaced far more often than the parts they hold.

Why people replace one

  • A low-speed knock has snapped the bracket while leaving the panel it holds undamaged.
  • A panel sits proud, droops at one end, or has a gap that will not close, because the bracket behind it has cracked.
  • A rattle or a creak over bumps, where a broken bracket is letting a panel move against the body.
  • The bracket was broken during a previous repair, taking a bumper or a lamp off, and never replaced.
  • A lamp or a panel has been held on with tape, glue or a repair plate and the proper part is wanted.

Fitting it

  • Most brackets are reached only with the panel they carry removed, so the job is usually done at the same time as the panel comes off anyway.
  • They are held by screws, plastic nuts or clips into the body, and the fasteners are often broken on removal and worth having to hand.
  • A bracket sets the position of the panel in front of it, so the panel gaps are worth checking before everything is tightened down.
  • Where a bracket has snapped, look at the body mount behind it as well. The same knock often distorts the metal the bracket screws to.

Making sure it is the right one

  • Match the part number. Brackets are handed, and the two sides of a car take different numbers even where they look like mirror images.
  • A bracket is specific to the panel it carries and to the trim level, so one from a different version of the same model may locate in the body and still hold the panel in the wrong place.
  • Count the fixing points and compare their spacing with the broken part in front of you. This is the quickest check there is.
  • A repair plate is not the same part. If the original has snapped, the proper bracket restores the panel position; a plate holds it wherever it happens to sit.

What to look for in the photographs

A Part number — Moulded or stamped into the body of the bracket. This is the number to match, because handed parts look alike.
B Fixing points — The holes, slots and studs that screw to the body. Count them and compare the spacing with your own part.
C Locating pegs — The pins or tabs that set the panel's position. A sheared peg means the panel will sit wrong even though the bracket bolts up.
D Stress points — The narrow sections and the moulded ribs, where a bracket fails. Look at these rather than at the broad faces.
E Handing — Which way the arms and tabs face. Hold the photograph against your own part rather than judging by the overall shape.

This section describes brackets and mountings parts in general. The numbers and the photographs above are this part.

Free next-day delivery in the United Kingdom Sent with DPD on a tracked, next-day service. Most mainland addresses are next day; the Highlands and Islands, Northern Ireland, the Channel Islands and the Isle of Man can take a day longer.

Returns Thirty days to change your mind, and we pay the return postage in the United Kingdom and Germany.

Trade and VAT C.E.J Haime Group Limited is VAT registered in England and Wales, and every order comes with a full VAT invoice.

Not sure it is the right part? Send us your registration or VIN and we will check this part number against your own vehicle before you buy.

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