Mercedes-Benz C-Class Fog Lights: Specs, Fitment & Common Faults
A genuinely distinctive finding: only one rear fog light is actually fitted on many models, positioned on the driver's side only — plus an important finding that a dedicated control module governs all the front lights, and can fail alongside the fuse box.
Illustration for editorial purposes
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Mercedes-Benz C-Class Fog Lights: OEM Part Number
Mercedes-Benz C-Class Fog Lights: Rarely Used, Easy to Forget About Until Needed
Fog lights are one of those parts on the Mercedes-Benz C-Class nobody checks until they need them, and with most owners using them only a few times a year, a fault can linger unnoticed for a long time before a foggy morning finally reveals it.
Mercedes-Benz C-Class Fog Lights: 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 C-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 C-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 C-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.
Mercedes-Benz C-Class Fog Lights: Generations, Derivatives & Fog Light Type
| Standard/non-AMG cars | Round halogen fog lamp (H11 bulb, confirmed genuine part number 2518200756) — genuinely a completely different design from the Sport/AMG package cars, not just a finish difference |
|---|---|
| AMG Styling Package (Code 772) cars | A different fog light design specific to this package — confirmed as not interchangeable with the standard round halogen unit, and some non-AMG sedans without the Luxury Package have no fog light fitted at all, just a blanking cover in its place |
| Fitment note | Upgrading from halogen to LED is possible either as a bulb-only swap or a full aftermarket LED assembly — a bulb-only swap can trigger a "bulb out" warning on some cars depending on the LED bulb's electrical characteristics |
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A Genuinely Distinctive Finding Worth Knowing — Mercedes-Benz C-Class Fog Lights
If a rear fog light appears not to be working on one side, this is genuinely worth knowing on many models: 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 or has failed on the opposite side, since there was never a bulb there to begin with on many of these models.
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, since the car's monitoring system expects the electrical characteristics of the original bulb type, not necessarily indicating a genuine fault.
Mercedes-Benz C-Class Fog Lights: Common Faults, DIY Difficulty & Aftermarket Advice
These are the same regardless of make or model — see our full Fog Lights Guide for common faults to check for (including exactly what fails an MOT), how easy this job is to DIY, and aftermarket advice.
More Mercedes-Benz Fog Lights
The same part, covered across other Mercedes-Benz models.