What is the reason why the light fault indicator on a Volkswagen car cannot be turned off?

[SanParker]

If the light fault indicator on a Volkswagen car cannot be turned off, it indicates that the bulb is damaged or there is a circuit fault, and it needs to be checked and repaired at a service center. Additional Information: 1. Bulb Damage: The bulb damage indicator is easy to recognize, usually represented by a bulb shape with an exclamation mark inside. Apart from the normal lifespan of the bulb, bulb issues are generally related to the quality of the bulb. Headlights are most susceptible to water ingress. If the headlight seal is poor, water vapor can accumulate, which can cause the filament to burn out and the reflector to discolor. As a result, the light emitted after a fault will be problematic. 2. Xenon Lights: Xenon lights, also known as gas discharge lamps, were successfully developed after five years of research and were initially used mainly in industrial and architectural lighting. Their advantages include high brightness, long illumination time, good stability, and energy efficiency. Automotive xenon lights are improved versions of industrial xenon lights. Automotive xenon lights operate at 12V, with wattages of 35W and 55W. Most vehicles use 35W, while a few use 55W, which are mostly installed in high-beam headlights.

[TravisDella]

My Volkswagen also had the issue of the light fault indicator staying on last year, which almost drove me crazy. It took half a day at the 4S shop to get it fixed. It was mainly the lighting system protesting—either a bulb was about to fail but hadn’t completely burned out yet, and the system detected abnormal current; or the wiring connector was oxidized or had poor contact, preventing signals from reaching the onboard computer; or maybe the control module froze, just like a phone getting stuck. I remember they used a computer to diagnose it and found that the left headlight’s wiring connector had moisture inside. After cleaning, drying, and performing a system reset, it worked fine. Don’t ignore such warning lights—after all, they’re crucial for night driving.

[LukeLynn]

From a repair perspective, if the Volkswagen warning light for lighting faults won't turn off, it's usually due to one of four issues: the bulb itself is of poor quality or has reached the end of its lifespan, causing the system to detect abnormal power consumption; aging or loose wiring harness connectors leading to intermittent signal transmission; the control unit's software needs an update or has burned out entirely; or the sensor is covered in dust and grease, affecting its judgment. It's best to use a diagnostic tool to read the fault code and pinpoint the issue. Last time, I encountered a Golf owner who replaced the LED bulbs without decoding, causing the warning light to stay on constantly. If you're handy, you can check the relevant interfaces in the fuse box, but when it comes to the car's computer, it's advisable to use professional equipment. After all, tampering with the electrical system might trigger other alarms.

[Roland]

As a veteran driver with ten years of experience, I've found that Volkswagen's lighting fault warning light must be addressed promptly. The onboard computer is alerting you to an issue with the lighting system—it could be a flickering bulb due to poor contact or a short circuit causing a false system error. I remember once noticing this light before a highway trip, and upon inspection, discovered that the modified headlights' excessive power had burned out the relay. This issue shouldn't be delayed; at best, a bulb might suddenly go out, impairing visibility, and at worst, it could lead to wiring fires. The standard method is to disconnect the battery's negative terminal for five minutes to force a reset; if that doesn't work, professional diagnostics are needed. Night driving safety comes first—never take lighting issues lightly.