What are used automobile parts called?

A Comprehensive Glossary of Slang Used in the Used Automobile Parts Market
In auto repair shops and salvage yards, old parts are never called "used."  Experts use these coded terms for transactions:

I. Officially Defined Categories

• Salvaged Parts

Parts completely removed from scrapped vehicles, retaining original oil residue and wear marks.
Applicable parts: Automobile doors/bumpers/rearview mirrors (usable if there is no visible deformation)

• Off-Line Parts

Defective products rejected by the manufacturer's quality control (e.g., poorly sealed headlights, scratched interior panels)
Bargain hunting tip: Be cautious when buying electronic parts; metal parts are worth checking out.

• Disassembled Parts

Parts salvaged from accident vehicles (e.g., airbags deployed but engine intact)
Risk warning: You must see photos of the Automobile before disassembly to avoid buying a "water-damaged engine."

II. Gray Area Categories

• Repaired Parts (a major area for fraudulent practices)

Accident-damaged beams straightened and repainted, transmission valve bodies with replaced casings.
Deceptive tactic: Sold as "original factory salvaged parts" at double the price.

• Port Parts

Parts from smuggled Automobiles cut up abroad (e.g., right-hand drive steering mechanisms converted to left-hand drive)
Hidden danger: Failure to match the VIN during vehicle inspection will result in vehicle confiscation.

III. Scrap Recycling Categories

• Recycled Parts

Large metal parts such as engine blocks/crankshafts, sold to scrap yards by weight (aluminum parts 12 yuan/catties, iron parts 0.8 yuan/catties)

• Core Parts

Core components extracted from scrapped parts:
Catalytic converters with precious metal Automobileriers (containing platinum, rhodium, and palladium)
Alternators with copper coils

Analysis of Expert Transaction Slang