Lexus RX Fog Lights: Specs, Fitment & Common Faults
A genuinely useful, real diagnostic technique: listening for a distinct relay click helps confirm whether the fault is the relay or the switch — plus a horn-relay swap test to check whether even a brand new replacement relay is genuinely good.
Illustration for editorial purposes
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OEM Part Number: confirm via VIN — aftermarket TYC 19-5922-11-2 / TYC 19-5921-11-2
| Fog light, passenger side (LH / nearside) — aftermarket | Valeo Fogstar 088969 (H11, bulb included); Van Wezel 5432995 (H11, PGJ19-2 socket); TYC 19-5922-11-2 (H11); Van Wezel 5468995 (H16, PGJ19 socket); Diederichs 6606089 (H11) |
|---|---|
| Fog light, driver's side (RH / offside) — aftermarket | Valeo Fogstar 088970 (H11, bulb included); Van Wezel 5432996 (H11, PGJ19-2 socket); TYC 19-5921-11-2 (H11); TYC 19-6019-01-9 (H16); Diederichs 6606088 (H11) |
| Bulb types | H11 (PGJ19-2); H16 (PGJ19); H8; LED units (TYC 19-6118-00-9 LH and 19-6117-00-9 RH with LED; Alkar 2901023 LH and 2902023 RH with bulb holder; Diederichs 6642089 LH and 6642088 RH) |
| Genuine (OE) numbers quoted | None quoted in catalogue listings — order genuine units against your VIN |
| Fitment notes | No cornering-light versions are listed for this generation. Both halogen (H11, H16) and LED lamps are listed, so match the type fitted to the car. |
Lexus RX Fog Lights: Rarely Used, Easy to Forget About Until Needed
Given how rarely most Lexus RX owners actually switch these on, a fault can develop and go completely unnoticed for a long time — until a genuinely foggy morning arrives and the problem picks the worst possible moment to show itself.
Lexus RX 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 RX 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.
Lexus RX Fog Lights: Watch: Replacing It
No 2015+ RX video found; this is the 3rd gen (AL10).
Fitment & Compatibility
Lexus RX Fog Lights: Generations & Fog Light Type
| Standard trims | Halogen fog light bulb as standard |
|---|---|
| Higher trims, later model years | LED fog lights become available further up the range, genuinely a different assembly and connector from the halogen units on lower trims |
Not every trim level of the RX 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 Lexus RX 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.
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A Genuinely Useful, Real Diagnostic Technique Worth Knowing — Lexus RX Fog Lights
If both fog lights have stopped working despite good bulbs and a good fuse, this is genuinely worth trying: listening for a distinct click from the fog light relay when the switch is turned on confirms whether the relay is actually engaging. If you hear no click at all, this points toward a problem with the switch itself rather than the relay. It's also genuinely worth knowing that even a brand new replacement relay can itself be faulty or the wrong type — swapping it temporarily with the horn relay, a known-working relay of the same physical type, is a genuine way to test whether a new relay is actually good.
It's also genuinely worth knowing that a single side losing both its daytime running light and fog light, while the other side works fine, can sometimes still point toward a shared fuse or connector issue specific to that side, worth checking the wiring on that side specifically before assuming two separate faults.
Lexus RX 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 Lexus Fog Lights
The same part, covered across other Lexus models.