The function of the decorative strip on the left side of the car's rear bumper
The left decorative strip of the car's rear bumper (usually referring to the trim strip below or along the edge of the rear bumper) mainly serves both decorative and functional purposes. Its specific functions are as follows:
Decorative Function
Enhance visual layering: By using materials such as chrome, high-gloss black, matte, or stainless steel, it enhances the three-dimensionality and refinement of the rear of the vehicle.
Strengthen lateral extension: It makes the rear look wider and more stable, especially in sedan or SUV models.
Match the overall design style: For example, the continuous chrome trim strip of Lincoln Navigator, or the silver underguard of Shenzhou, all reflect the exclusive aesthetic language of the brand or model.
Practical Function
Protect against scratches and damages: During loading and unloading items, getting on and off the vehicle, or parking in narrow spaces, it reduces scratches and dents on the original factory paint or bumper.
Absorb minor impacts: Some trim strips use TPU, rubber, or have a buffer layer structure, and in low-speed collisions, they play a certain role in energy absorption.
Weather-resistant and corrosion-resistant: High-quality materials (such as 304 stainless steel, ABS + electroplating) can resist the effects of rain, dust, and ultraviolet rays for a long time, maintaining the stability of the appearance.
Note: If the decorative strip is an original factory standard (such as the rear bumper guard of Shenzhou), it is usually a plastic outer plate + metal crossbar structure, combining decoration and basic protection; if it is an aftermarket add-on, it focuses more on aesthetics and local protection.
After the left decorative strip of the car's rear bumper is damaged, whether to replace it and how to handle it depends on the degree of damage and your usage needs. Here are comprehensive suggestions based on public information:
Do you need to replace it?
Minor damage (such as small cracks, scratches): If it does not affect appearance or usage, you can temporarily not replace it; you can also try plastic welding repair (low cost but the strength and appearance may not be good).
Serious damage (such as cracking, obvious deformation): It is recommended to replace it, because chrome-plastic material is brittle and difficult to repair by pasting or other methods reliably.
Choose the replacement method
Self-replacement (suitable for those with some manual skills):
Tools needed: screwdriver, plastic pry bar (avoid scratching the paint surface), new decorative strip.
Disassembly of the old strip: Straighten the locking tab from the inside of the bumper or gently pry it up from the edge with a screwdriver. The old strip usually breaks at the locking tab.
Installation of the new strip: Align the slot, gently press the locking position to make it bite; do not use brute force to hit, otherwise the new strip is prone to break.
Precautions: Some models require removing the rear bumper or rear wheel fender to operate.
The specific installation method of the left decorative strip of the car's rear bumper varies by model, but generally follows the principle of "prepare well, remove gently, clean and fit, check for firmness". The following are general steps and key precautions:
General installation steps
Preparations
Park the car in a safe area, turn off the power.
Tools needed: plastic pry bar, screwdriver, T-type screw (for some models), 10mm wrench, air freshener or hair dryer (for softening old glue or locking tabs).
Clean the installation area: Wipe the bumper surface with alcohol or automotive-specific cleaner to ensure there is no dust, oil, and dry thoroughly.
Disassembly of the old decorative strip
Locking tab type: Use a plastic pry bar or screwdriver to gently pry the locking tab from the edge to avoid scratching the paint surface; if the locking tab breaks, clean the remaining locking tab.
Adhesive type: If using 3M double-sided tape, heat (hair dryer) or apply air freshener to soften the glue, then slowly peel off.
Screw-fixed type (such as Mercedes-Benz C200L): First remove the surrounding fixing screws, then remove the decorative strip.
Installation of the new decorative strip
Locking tab type: Align the slot, gently press from the middle to both ends to ensure the locking tab is fully bitten; for longer decorative strips, it is recommended to operate with two people.
Paste type: Remove the 3M adhesive protective layer, align the position and start attaching from one end. Press firmly with a towel for more than 3 minutes to ensure a secure bond.
Mixed fixation type (for some Volkswagen models): First install the snap fasteners, then use T-type bolts to reinforce the inner support.
Inspection and adjustment
Check if the trim strip is flat and not warped, and ensure that all snap fasteners are securely fastened.
If there are gaps or looseness, fine-tune the position of the snap fasteners. Do not forcibly pull.
Common vehicle models reference
Volkswagen Passat B8: Remove the old strip from the inside of the bumper by straightening the lock tab; when installing, align the middle first and then press to both sides; it is recommended to do this with two people working together.
Chengdu PLUS DM-i: Remove the old strip by straightening the lock tab from the inside; after attaching the new strip, press evenly with a towel.
Geely Emgrand GS: Use a screwdriver to pry open the loose lock tab at the edge of the trim strip, and then install the new strip in the reverse direction.
Qin MAX DM-i: Remove the old strip by straightening the lock tab from the inside; after attaching the new strip, press evenly with a towel.
Geely Emgrand GS: Use a screwdriver to pry open the loose lock tab at the edge of the trim strip, and then install the new strip in the reverse direction.
Qin MAX DM-i: Fix with snap fasteners; when removing, gently pry the snap fastener; when installing, press to ensure a secure fit.
Precautions
Environmental temperature: It is recommended to operate in a temperature range of 15–30℃. Cold temperatures can cause the adhesive or snap fasteners to harden, while high temperatures can reduce the adhesive strength.
Protect the original vehicle paint surface: Use plastic pry bars instead of metal tools. If necessary, wrap a soft cloth on the tool head.
Adhesive quality: Preferably use brands like 3M for double-sided adhesive; avoid using inferior adhesives to prevent detachment.
Complex situations: If it involves wiring (such as the daytime running lights) or complex structures, it is recommended to operate at a professional auto repair shop.
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