How to Identify Whether a Car Door is an Original Part?
2 Answers
Identifying whether a car door is an original part involves checking the part number and the manufacturing serial number on the door. A car door provides access for the driver and passengers, isolates external disturbances, and to some extent mitigates side impacts to protect occupants. The removal method is as follows: 1. Pry off the panel of the window regulator; 2. Disconnect the control wires and remove the adjacent fixing screws; 3. Remove the door handle and pry off the fixing panel of the door switch. The design requirements for car doors include: 1. Ensuring ease of access for passengers, with an opening angle controlled between 65 to 70 degrees; 2. No positional interference with other parts during the opening process; 3. Reliable locking when closed to prevent accidental opening while driving; 4. Excellent sealing performance; 5. A large transparent area to meet lateral visibility requirements; 6. Sufficient strength and rigidity to ensure reliable operation, reduce vibrations, enhance side collision safety, and prevent door sagging.
When I last replaced a car door, I specifically researched the characteristics of OEM parts, and there are several key points to identify them. The most direct method is to check the OEM markings on the door, such as the brand logo, part number, and vehicle identification sticker. OEM parts usually have finer craftsmanship, with uniform steel thickness, smooth edge treatment, and no burrs. The OEM paint finish also has better texture, with a natural color transition to other parts of the body and no color mismatch. Additionally, OEM doors have particularly uniform gaps, especially at the connections with the fender and adjacent doors, with millimeter-level precision. I also noticed that OEM doors weigh almost the same as the original ones, while aftermarket parts tend to be lighter. Small details like the soundproofing foam and wire harness clips inside the door also show differences—OEM parts are meticulously crafted in every aspect.
