What is the perforated lower bumper at the rear of the car?
The perforated parts on the lower bumper of the car are mainly for the installation of the tow hook (central/biased side, with a larger cover plate) or the reversing radar probe (distributed on both sides, with small round holes), and a few are for drainage/ventilation holes.
Core identification features:
Tow hook hole: Usually located in the center or slightly below the bumper, it is square or large circular in shape, equipped with a plastic cover plate that can be removed (often marked "TOW" or without any marking), and the interior has a threaded interface for emergency rescue to install the tow ring.
Reversing radar hole: Mostly symmetrically distributed on both sides and in the center of the bumper, with a small diameter (about 1-2 cm, similar to the size of a coin), without a cover plate or with a slightly raised probe, used for ultrasonic distance measurement and alarm.
Drainage/ventilation holes: Located at the bottom edge of the bumper, with irregular or elongated hole shapes, used to drain internal water or balance air flow, non-functional interfaces.
Functions and uses:
Tow rescue: When the vehicle breaks down, remove the cover plate and insert it into the vehicle-mounted tow hook to connect the towing equipment.
Parking assistance: Emit/receive ultrasonic waves to detect obstacles behind and trigger an alarm.
Protection and maintenance: Prevent water accumulation inside the bumper from rusting or overheating, maintaining aerodynamic performance.
Quick identification methods:
Look at the position: Central/biased side large holes are mostly tow hook holes; evenly distributed small holes are mostly radar holes.
Look at the shape: With a removable cover plate as a tow hook hole; with a bare probe or a slightly raised probe as a radar hole.
Look at the quantity: There is usually only 1 tow hook hole; the radar holes are often arranged in rows of 4-6.
If unsure about the specific design of the vehicle model, it is recommended to consult the vehicle's "User Manual" or check if there is a "TOW" marking on the cover plate to avoid incorrect operation and damage to components.
The perforated parts on the lower bumper of the car are mainly for the tow hook installation (core function), and some models are also used as air flow guide/heat dissipation channels or radar wiring holes, not for a single purpose.
Core function classification:
Tow rescue interface: The most common use, with a hidden standard threaded hole under the cover plate for emergency removal and insertion into the tow hook for towing; usually located in the middle or slightly below the bumper, with a square or circular cover plate.
Aerodynamic optimization: Guides the vehicle's airflow to quickly exit, reduces rear turbulence and vacuum areas, reduces drag (about 5%-8%) and improves high-speed stability; some designs also assist in discharging exhaust/brake heat.
Sensor and drainage assistance: A few small holes are used for the reversing radar probe wiring or internal condensate drainage to prevent corrosion or water seepage into the trunk.
Quick identification methods:
Look at the position and size: Central or biased side, larger (like a matchbox/round cover) are tow hook holes; distributed on both sides and smaller (like a coin-sized) with a probe are radar holes.
Look at the cover plate characteristics: Tow hook holes usually have a removable decorative cover (press or pry open); radar holes are often embedded with a probe or a sealing rubber ring; pure drainage holes are usually open grilles without a cover plate.
Check the manual for confirmation: Different vehicle models have significant layout differences, the exact position and function are based on the vehicle manual.
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