Usually, the situations that need to replace the headlight assembly include the following:

  1. Serious damage: If the car headlights are severely impacted or damaged, such as a collision accident that causes the headlights to crack or deform, the entire headlight assembly may need to be replaced.

  2. Yellowing or whitish: Car headlights are usually made of polycarbonate or polyacrylic materials, which may turn yellow, whitish, or lose transparency over time and exposure to sunlight, pollutants, etc. Case. If cleaning and polishing cannot restore the clarity of the headlight, then replacing the headlight assembly may be the only solution.

  3. Bulb failure: If the bulb in the headlight burns out or fails frequently, and replacing the bulb does not solve the problem, the entire headlight assembly may need to be replaced.

  4. Upgrades or Modifications: Some owners may wish to upgrade or modify the exterior of their vehicle, including brighter or more distinctive headlights. In this case, replacing the entire headlight assembly can achieve a cosmetic change and upgrade.

  In general, the decision to replace a car headlight assembly depends on the degree of damage to the headlight, functional failures, and individual needs. If you are not very confident in your abilities or have doubts about the diagnosis, it is best to consult a professional auto repair shop or technician for accurate advice and necessary replacement.