Mercedes-Benz E-Class Fog Lights: Specs, Fitment & Common Faults
A genuinely distinctive finding: only one rear fog light is actually fitted on this model, positioned on the driver's side only, and shares its filament with the upper tail light on some versions.
Illustration for editorial purposes
OEM Part Numbers
Rarely Used, Easy to Forget About Until Needed
Fog lights sit unused for most owners most of the year, which means a fault can go unnoticed for a long time — right up until a genuinely foggy morning makes the problem obvious at the worst possible moment.
What It Does
Front fog lights are angled and positioned to illuminate the road surface in low visibility conditions without creating the glare a standard headlight beam would in fog. Some higher trims of the E-Class integrate fog lights into the same housing as cornering lights or daytime running lights, which affects both the part number and the complexity of any repair.
Fitment & Compatibility
Not every trim level of the E-Class comes with fog lights fitted as standard, and the housing design often differs between trims that have them integrated with other lighting functions and those with a standalone unit. Always confirm your specific trim's fitment before ordering. Whether you're sourcing a replacement fog lights for your Mercedes-Benz E-Class from a dealer, specialist, or online marketplace, always check compatibility against your registration or VIN before buying, and confirm you're ordering the correct side — driver's side (RH in the UK) or passenger side (LH in the UK) — since these are not interchangeable.
Common Faults
What to Look For
- One side not working — usually a blown bulb, the most common and easiest fault to fix.
- Neither side working — more likely a blown fuse or a faulty switch than two bulbs failing simultaneously.
- Condensation inside the lens — points to a failed seal, worth addressing before it affects the bulb or wiring.
- Cracked housing from front-end impact — common given their low mounting position, usually a straightforward like-for-like replacement.
DIY Replacement Difficulty
Bulb replacement is usually an easy DIY job, though access varies — some versions require reaching up from underneath via the wheel arch liner, others come apart from the front. Full housing replacement is similarly straightforward on most versions. Expect 15–30 minutes for a bulb swap, longer if the housing itself needs replacing.
A Genuinely Distinctive Finding Worth Knowing
If a rear fog light appears not to be working on one side, this is genuinely worth knowing on this model: only one rear fog light is actually fitted, positioned on the driver's side only, rather than there being a matching pair — worth knowing this before assuming a bulb is missing on the opposite side. It's also genuinely worth knowing that the rear fog function on some models shares its bulb filament with the upper tail light, with the fog function simply switching to a higher voltage when selected, meaning if the tail light works, the fog function normally will too.
It's also genuinely worth knowing that replacing any external light bulb with an LED bulb can genuinely trigger a "defective lights" warning message on the dashboard, not necessarily indicating a genuine fault.
OEM vs. Aftermarket
Reputable aftermarket fog light units and bulbs are a reliable, cost-effective alternative to OEM parts for the vast majority of cases, since this is a relatively simple lighting component without the complexity of adaptive or LED headlight systems.
More Mercedes-Benz Fog Lights Guides
The same part, covered across other Mercedes-Benz models.