BMW 4 Series Fog Lights: Specs, Fitment & Common Faults

On the 4 Series, all external bulbs are genuinely controlled by a single module on related models, worth checking if bulbs and fuses all check out fine.

Illustration for editorial purposes

OEM Part Numbers

Accuracy note: we weren't able to verify a confident BMW 4 Series fog lights part number at the time of writing. Please confirm the correct part via a BMW dealer or parts specialist using your VIN.

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.

Before you buy: fog light fitment and bulb type vary by trim — not every trim level includes them as standard. Always confirm against your VIN before ordering.

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 4 Series 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

Generations, Derivatives & Fog Light Type

Standard trims	Halogen (HB4/9006) bulb-based fog lights as standard
M Sport, factory option	Genuine BMW retrofit LED fog lights are offered as a direct replacement for the halogen units on cars WITHOUT adaptive headlights, since adaptive-equipped cars use a different lighting strategy

Not every trim level of the 4 Series 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 BMW 4 Series 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.

A Genuinely Useful Piece of Context Worth Knowing About Fog Light Faults — BMW 4 Series Fog Lights

If bulbs and fuses all check out fine yet the fog lights still don't work, this is genuinely worth knowing: all external bulbs are controlled by a single electronic module on related BMW models, rather than being wired directly and independently. A fault with this specific module is a commonly suspected cause worth having checked.

A genuinely useful clarification worth knowing: on some models, the front fog lights genuinely won't illuminate at all if the main beam headlights are switched on — a deliberate design characteristic rather than a fault.

It's also genuinely worth knowing that a faulty fog light switch has been reliably fixed in documented cases simply by disassembling it and cleaning the internal contacts, a fix that can genuinely last for decades afterward.

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 BMW Fog Lights

The same part, covered across other BMW models.

BMW 4 Series Fog Lights: Specs, Fitment & Common Faults

OEM Part Numbers

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A Genuinely Useful Piece of Context Worth Knowing About Fog Light Faults — BMW 4 Series Fog Lights