AUDI E-TRON GT 2021-2023 LEFT SIDE HEADLIGHT 4J3941085A

Part number 4J3941085A. 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 4J3941085A

A headlight is a crucial component of a vehicle's exterior lighting system. Positioned at the front of the vehicle, it connects to the main wiring loom and the central electrical control unit. When functioning correctly, it casts a clear beam of light onto the road ahead, providing essential visibility for night driving and ensuring the vehicle is clearly visible to other road users.

To ensure this component is correct for your vehicle, you must check the part number directly against the one on your original unit. The manufacturer part number for this item is 4J3941085A, which is typically stamped or printed on a label attached to the main outer housing or rear plastic casing. Matching this exact number is the only way to guarantee correct fitment.

Headlights are commonly replaced due to impact damage from road debris, cracked lenses, or internal electrical failure. When replacing a headlight, it is often necessary to source replacement mounting clips, fixings, or bulbs if they are not transferred from the original unit. Professional alignment of the light beam is always recommended after fitting a replacement headlight to prevent dazzling oncoming traffic.

About this kind of part: headlamps

A headlamp is a sealed unit holding the main beam, the dipped beam, the daytime running light and usually the indicator. The light source is either a bulb, a gas discharge capsule or an array of light-emitting diodes, and the three are not interchangeable within one lamp housing. The lens is polycarbonate with a hard coat on the outside, the housing is plastic, and the whole unit hangs on moulded lugs that bolt to the slam panel and the inner wing.

Why people replace one

  • An impact has broken the lens or cracked the housing, so water gets in and the unit mists up.
  • The hard coat on the lens has broken down and the surface has gone yellow and cloudy, which cuts the light output and fails an inspection.
  • A mounting lug has snapped, which is common because the lugs are the first thing to give in a light front-end knock. The lamp then sits low or loose.
  • Condensation sits inside the lens after rain, because a seal or a breather has failed.
  • The adjusting mechanism behind the lamp has stripped, so the beam cannot be set.

Fitting it

  • A headlamp is reached with the front bumper cover off on most cars, and is held by three or four bolts.
  • The beam must be aimed on a proper beam setter after fitting. A lamp that has been swapped and not aimed will dazzle oncoming traffic and will fail an inspection.
  • The adjusters are plastic and are easier to set with the lamp loosely held before the bolts are tightened.
  • If a mounting lug on your own lamp has broken, the repair brackets sold for the job are a temporary measure rather than a fix.

Making sure it is the right one

  • Match the part number on the lamp. Within one model the bulb, discharge and diode versions all share the same body shape and will plug in, but the car will not light them correctly.
  • A lamp built for a market that drives on the left and a lamp built for a market that drives on the right have different beam patterns, even where the part looks identical. The pattern is marked on the lens.
  • The lens marking also records the approval, and comparing that marking with your own lamp is a quick way to confirm the two are the same specification.
  • Count the connector pins and compare the block shape with your own lamp before buying.

What to look for in the photographs

A Part number — On a printed label on the back of the housing, or moulded into the plastic. This is the number to match.
B Lens marking — Etched into the lens itself: the approval marks and the beam pattern. Compare it with the marking on your own lamp.
C Mounting lugs — The moulded arms that bolt the lamp to the car. Check each one is whole, because a snapped lug is the most common fault and the hardest to see.
D Connector block — The plug on the back. Count the pins and compare the shape, as a different light source means a different block.
E Lens surface — Look across the lens at an angle rather than straight on. Fine crazing and a breakdown of the hard coat show up in a raking light and vanish in a flat one.
F Housing and seal — The joint where the lens meets the housing, and the rubber covers on the back. Water gets in where these have been disturbed.

This section describes headlamps 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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