Rear lights often take a back seat when we talk about car lighting. Everyone focuses on the headlights because, logically, they light up the road. But rear lights are just as important for safety because they signal your presence, braking and turning direction to the drivers behind you. And when one rear light is out, that is not just a cosmetic problem, it is a serious safety risk and a reason to fail a vehicle inspection.
The good news? Used rear lights are one of the most cost-effective used parts you can buy. Here is why and how to do it smartly.
What counts as rear lights?
When we say "rear lights", that is actually a collective term for several different functions packed into one or more housings:
- Position lights - red lights that mark the presence of the vehicle, always on when the headlights are on
- Brake lights - a stronger red light that comes on when you press the brake
- Turn indicators - yellow (orange) flashing lights that signal turning
- Reversing lights - a white light that comes on when you select reverse
- Rear fog lights - a strong red light for driving in fog, usually only on one side
- Third brake light (CHMSL) - an additional brake light mounted in a high position, required on all cars since 1998
On modern cars, all these functions are often split between two assemblies: the main rear light on the side and an additional part in the boot lid (or on the rear of the body). When you are looking for a replacement, you need to know exactly which part you need.
Why do rear lights fail in the first place?
Rear lights are actually quite durable, but nothing lasts forever. Here are the most common reasons you might need a replacement:
A traffic accident
The most common reason. Even a light bump to the rear of the car can break or crack a rear light housing. And here is an interesting thing: rear lights are designed to break on impact so they absorb part of the energy and protect the body. That means replacing rear lights after a collision is almost routine work for a body shop.
UV degradation
The plastic of the rear light housing degrades over time under the influence of sunlight. The red colour fades, the plastic becomes brittle and can crack. This is especially pronounced for cars parked outdoors in southern regions where sun exposure is more intense.
Moisture and corrosion
Rear light seals dry out and crack over the years, allowing moisture to enter the housing. The moisture then corrodes the electrical contacts, destroys reflectors and creates permanent stains on the inside of the lens. Once moisture has entered and caused damage, repair is usually not cost-effective and replacing the whole assembly is the only solution.
Overheating with conventional bulbs
On older cars with classic bulbs (P21W, P21/5W), long-term use can cause overheating that deforms the plastic around the bulb socket. If the plastic is deformed, the bulb does not sit firmly and the contact is poor, which causes flickering or a complete loss of function.
How much do used rear lights cost?
Rear lights are generally cheaper than front headlights, which makes sense given they are simpler. Here are approximate prices for popular models:
Conventional rear lights (with bulbs)
- VW Golf 5/6/7 - EUR 20 to 60 per unit
- Opel Astra H/J - EUR 15 to 45 per unit
- Ford Focus 2/3 - EUR 20 to 50 per unit
- Skoda Octavia 2/3 - EUR 20 to 55 per unit
- Peugeot 308 - EUR 20 to 50 per unit
LED rear lights
- VW Golf 7/8 LED - EUR 60 to 150 per unit
- BMW 3 Series (F30/G20) - EUR 80 to 200 per unit
- Audi A4 (B8/B9) - EUR 70 to 180 per unit
- Mercedes C-Class (W205) - EUR 80 to 250 per unit
Third brake light
- Most models - EUR 10 to 40 used
- Sporty models with LED strip - EUR 30 to 80 used
By way of comparison, a new LED rear light for a BMW F30 costs EUR 300-500. A used one in excellent condition can be found for EUR 100-150. A saving of 60-70% is quite convincing.
What to watch for when buying used rear lights
As with headlights, there are key things you must check:
Cracks and housing damage
This is an absolute deal-breaker. If the housing has a crack, no matter how small, moisture will get in and the inside will be ruined. Inspect the entire housing, especially the edges and the areas around the screws because cracks tend to start there. Use a small torch and inspect the lens from various angles.
Lens condition
The lens must be clean, without scratches deeper than surface marks and without white stains. A faded lens not only looks bad, it also reduces the visibility of your lights for other drivers. A small surface scratch is acceptable, but deep scratches or moisture stains are not.
Electrical contacts
Check the connector and the bulb sockets. The contacts must be clean, without the green patina of corrosion. Corroded contacts are a common cause of rear light problems, and cleaning is not always a permanent fix.
Bulb sockets
On conventional rear lights, check that the bulb sockets are not deformed or burnt. Try to insert a bulb and check whether it sits firmly. A loose socket means a poor contact and operating problems.
LED functionality
On LED rear lights, test all the functions if you can. LED chips cannot be changed individually because they are soldered to a board. If one LED segment does not work, the whole light is essentially unusable because you will not pass an inspection with a faulty LED segment.
Colour and shade
If you are only replacing one rear light, pay attention to the shade of the colour. Rear lights from the same model but different production years or different suppliers may have a slightly different shade of red or smoked glass. It is not a problem at inspection, but visually it can be noticeable.
The third brake light: a small part with big importance
The third brake light, positioned high on the rear of the car (usually on the boot lid or above the rear window), became mandatory on all new cars in Europe from 1998. Its purpose is to be at the eye level of the driver behind you, so that braking is visible even when your rear lights are blocked, for example when you are in traffic behind a truck.
Third brake lights most often use LED technology, even on cars that have conventional bulbs in the main rear lights. The catch is that they often have a shape that is specific to each model, so they are not easy to find. Used units are usually the only affordable option because new parts for this seemingly simple item can cost surprisingly a lot.
When buying a used third brake light, it is crucial to check that every LED segment works. Because the LEDs are soldered, there is no repair for those that have stopped working.
The difference between inner and outer rear lights
Modern cars often have rear lights split into two parts: an outer part mounted on the body and an inner part mounted on the boot lid. It is important to know this because:
- They are separate parts with separate part numbers
- They have different functions (e.g. the outer has position and brake, the inner has reverse and fog)
- They are bought separately
- The outer part is damaged more often in collisions because it is more exposed
When you send an enquiry for a used rear light, always state whether you need the outer or inner part (or both) and the side (left or right). That speeds up the process and reduces the chance of a mistake.
LED upgrade of rear lights
Many owners of cars that come factory-fitted with conventional rear lights with bulbs think about upgrading to the LED version. On some models (e.g. VW Golf 7, BMW F30), this is possible because the manufacturer offers both versions for the same model.
Used LED rear lights from a higher trim level can be a great upgrade. But keep in mind that the upgrade usually requires:
- A new wiring loom or adapter
- Coding via a diagnostic tool
- Sometimes a new body control module (BCM)
Before you commit to an upgrade project, research the specific requirements for your model. Owners' forums usually have detailed guides and experiences from others who have already done it.
Fitting used rear lights
Replacing rear lights is one of the simplest jobs on a car. On most models, the procedure looks like this:
- Open the boot
- Remove the trim panel on the inside (usually held by plastic clips)
- Unplug the electrical connector
- Undo the screws that hold the rear light in place (usually 2-3 screws)
- Carefully pull the rear light out of its housing
- Insert the new (used) light and reverse the procedure
The whole job takes 15-30 minutes per side and requires no special tools. The only thing to watch: be gentle with the plastic clips on the trim because they break easily and replacements are not always readily available.
On LED rear lights on newer cars, coding via a diagnostic tool may be needed after replacement so the system recognises the new light. That is especially true for cars with LED matrices or dynamic turn indicators.
How to find the right used rear light
The fastest way is to send an enquiry to PoDi. You need to provide:
- Make and model of the car
- Year of manufacture
- Side (left/right)
- Position (outer/inner or set)
- Type (conventional with bulbs or LED)
- If possible, the OEM part number if you know it
With this information, suppliers can quickly find the exact part for your car and send you a quote. It is free, fast, and saves you the time you would otherwise spend searching salvage yards.
One of the safest used parts to buy
Used rear lights are one of the safest used parts to buy. They do not have many wearing components, they are easy to check, and fitting is straightforward. The saving compared with new parts is significant, especially on the LED variants.
Do not drive with a faulty rear light. It is a safety risk, a reason for a fine and for failing a vehicle inspection. At PoDi we connect you with suppliers who have the right used rear lights for your car. Send an enquiry to PoDi and sort the problem quickly and affordably.