What is the plastic under the front bumper of a car called?

[VanEmma]

The plastic under the front bumper of a car is called a spoiler. Here is an introduction to the functions of the spoiler: 1. Reduce vortex: The car spoiler can reduce the generation of vortices. 2. Reduce air intake: Reduce the amount of air intake under the car chassis. 3. Improve stability: Improve the stability of the car body. Here is extended information about the repair methods for a damaged bumper: 1. Check the damage: Check the location and extent of the cracking damage on the bumper. 2. Prevent crack expansion: Drill a small hole at the end of the cracked area to prevent further expansion of the crack. 3. Reserve space: Use a grinder with a sanding disc to grind the paint coating on the bumper, forming a certain inclined slope on both sides of the crack to reserve sufficient space. 4. Cut and reinforce: Cut stainless steel for reinforcement, with a size suitable to wrap the crack, and fold the edges. 5. Dust and oil removal: Perform dust and oil removal operations on the bumper surface to facilitate welding the reinforcement mesh. 6. Fill the crack: Use special bumper repair fiberglass adhesive to fill the crack.

[CamilleLynn]

I've been driving for decades, and that part of the body is usually called the underbody shield, sometimes referred to as the lower spoiler. Its main purpose is aerodynamic optimization, reducing wind resistance to make high-speed driving more stable and even save a bit of fuel. If it gets scraped by potholes or shattered by rocks, it's important to replace it promptly; otherwise, the engine compartment can easily accumulate dust and water, damaging components. Last time I went on a long trip, I broke one, and the repair cost me two hundred bucks. The material is mostly engineering plastic—sturdy and rust-resistant but not great against impacts. Don't overlook this during maintenance checks to ensure driving safety. For modifications, it can also improve downforce a bit, but it doesn't make much difference for daily driving. Just replacing it with a new one is fine; no need to overcomplicate things.

[StellaFitz]

Having seen many such issues in the workshop, the professional term for the plastic component under the car's front bumper is the lower spoiler or splash guard. It's not just a decorative piece; its core function is to direct airflow, stabilize it to prevent vibrations, and enhance handling. Made from reinforced plastic to ensure lightweight and corrosion resistance, it's prone to damage and requires regular inspection. If damaged, it increases noise and affects fuel consumption. Repair costs are generally not high, and DIY can save some money, but beginners are advised to seek professional repairs to avoid installation errors. In daily driving, avoiding potholes to keep it intact is key to extending its lifespan.

[Brody]

We car modification enthusiasts usually call that plastic piece the front lip or lower spoiler, which is the most favorite part to adjust for exterior customization. The material is mostly ABS plastic, lightweight and affordable, making it easy to install and replace by yourself. Functionally, it controls airflow to reduce drag, keeping the car more stable at high speeds with less sway. Performance enthusiasts can even upgrade to a carbon fiber version for weight reduction. It often gets cracked by stones, but a few hundred bucks can fix it without affecting the driving fun—just check for cracks during routine maintenance.