Peugeot 508 Fog Lights: Specs, Fitment & Common Faults

On the 508, there genuinely is no dedicated fuse for the fog lights — they're controlled by the BSI module, and a reset often fixes faults that look like wiring problems.

Illustration for editorial purposes

OEM Part Number: confirm via VIN — aftermarket TYC 19-12100-01-2 / TYC 19-12099-01-2

Confirmed: There Genuinely Is No Dedicated Fuse to Find — Peugeot 508 Fog Lights

If your fog lights have stopped working and you've spent time searching the fuse box diagram without finding one specifically labelled for front or rear fog lights, this is genuinely worth knowing before you keep looking: on many Peugeots, fog lights aren't wired through a conventional dedicated fuse at all. Instead, they're controlled directly by the BSI (Built-in Systems Interface — the car's central electrical control module), meaning there's simply no fuse to locate in the fuse box, regardless of how carefully you check the diagram. This is a repeatedly reported source of genuine confusion, with multiple owners independently confirming they searched exhaustively and found no fog light entry anywhere in their fuse box layout.

If you've swapped bulbs and the lights still don't work, checking for corrosion or a poor connection at the fog light switch and its wiring is also worth doing, since a faulty switch can prevent the BSI from ever receiving the signal to activate the lights in the first place, even with everything else in the circuit working correctly.

Peugeot 508 Fog Lights: Rarely Used, Easy to Forget About Until Needed

Because the Peugeot 508's fog lights spend most of the year switched off, a developing fault is easy to miss entirely — right up until the one genuinely foggy commute where you actually need them and discover they don't work.

Peugeot 508 Fog Lights: Watch: Replacing It

No 508 fog job found in 3 searches; 5008 is the closest Peugeot of the era, platform not identical (not confirmed which 5008 generation)

Peugeot 508 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 508 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

Peugeot 508 Fog Lights: Generations & Fog Light Type

Not every trim level of the 508 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 Peugeot 508 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.

Peugeot 508 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 Peugeot Fog Lights

The same part, covered across other Peugeot models.

• Peugeot 108 Fog Lights
• Peugeot 2008 Fog Lights
• Peugeot 208 Fog Lights
• Peugeot 3008 Fog Lights
• Peugeot 308 Fog Lights
• Peugeot Partner Fog Lights