What is the reason why the right rear fog light does not light up?

[KimberlyLynn]

The right rear fog light may not light up due to a broken circuit on the right side or a damaged fog light bulb. Related introduction: 1. Introduction: Fog lights generally refer to automotive fog lights. Automotive fog lights are installed on the front and rear of the vehicle to illuminate the road and provide safety warnings during rainy or foggy weather, improving visibility for the driver and surrounding traffic participants. 2. Function: Due to low visibility in foggy conditions, the driver's line of sight is limited. The lights can increase the operating distance, especially the strong light penetration of yellow anti-fog lights, which enhances visibility for the driver and surrounding traffic participants, allowing oncoming vehicles and pedestrians to detect each other from a greater distance.

[VanLiam]

I've driven for several years and encountered a similar situation. The right rear fog light not working could be due to a burnt-out bulb. I noticed it during heavy rain—the right side was out while the left was clearly on, and replacing the bulb fixed it. Over time, the filament in bulbs can break. It might also be a loose plug not making proper contact, cutting off the current. You can check this yourself by opening the rear cover. Another possibility is a blown fuse, especially if there's a dedicated fuse for the right-side circuit—replace it in the fuse box. Wiring issues like aging or short circuits, such as corrosion from water ingress during rain, could also be the cause. A non-functioning rear fog light in rain or fog is dangerous—it makes it hard for vehicles behind to see your position, increasing the risk of rear-end collisions. I recommend addressing it immediately; if you can't fix it yourself, take it to a repair shop without delay.

[SanDamian]

Recently, I noticed the right rear fog light on my car isn't working while the left one is fine, which is quite annoying. Simply put, the most likely causes are: bulb failure (filament burnt out or poor contact), try gently shaking the socket to check responsiveness; loose plug connection interrupting current flow, feel around the rear light area to confirm; blown fuse (a common issue where excessive current melts it to protect the circuit), consult the manual to locate and replace the right rear fog light fuse; wiring problems like damage or short circuits, especially in older cars prone to such faults; or water ingress causing short circuits in rainy conditions or impact damage to the lighting system, either of which could cause the right side to fail alone. Address it promptly—it affects driving safety and may attract police attention—don't lose big over small issues.

[ChloeRose]

As a car repair enthusiast, I've disassembled many rear fog light cases. The right side not lighting up is often due to bulb issues, such as a broken filament or oxidized lamp base causing poor contact, which naturally cuts off the current. It could also be a loose or detached plug—check and tighten the rear cover. A blown fuse in the independent circuit might also block power supply. Wiring problems like open circuits or short circuits, especially corrosion-induced shorts in humid environments, can cause one side to fail. A faulty control module could also be the culprit if one-sided control malfunctions, though this is less likely. It's best to do a preliminary check yourself, like testing plug voltage or visually inspecting the bulb condition. If that doesn't work, take it to a professional shop—avoid random disassembly to prevent further damage.