Mazda3 Mazda 3 ADAPTIVE LED Headlight Light Lamp 2019- Left GENUINE BCJH-51040

Part number BCJH-51040. 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.

OUT OF STOCK

In the meantime you can see every Mazda part we have in stock, or you can send us a message and we will tell you the day one comes in.

Notify me when this part is back in stock

Leave your email address and we will write to you the day part number BCJH-51040 comes in. We use your address for that message only.

About part number BCJH-51040

A headlight unit provides essential forward illumination and helps make the vehicle visible to other road users at night or in poor weather conditions. As part of the exterior lighting system, this unit houses the internal lamp components and mounts directly into the front bodywork on the left-hand side, connecting to the main wiring loom. When operating correctly, it casts a clear, steady beam on the road ahead and responds properly to light switches and automatic dip controls.

To ensure this part is correct for your vehicle, you must check that the manufacturer part number matches BCJH-51040 exactly. On a headlight assembly of this type, the part number is typically printed on a white sticker or stamped directly into the plastic casing, usually found on the top surface or the rear housing. Comparing the number on your existing unit with this code is the only way to confirm correct fitment.

Headlight units are usually replaced following front-end impact damage, cracking of the lens, or internal failure of the lighting components and adjusters. When installing a replacement headlight, you may need additional fixings, mounting clips, or bulbs if they are not transferred from the original assembly, and the beam alignment should always be checked once fitted.

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.

Ask us about this part

Other part numbers on this site

See every Mazda part number we list · All part numbers · Everything in stock now