Japanese Auction Grades Explained: The Complete Guide to USS, TAA, JU & ARAI Ratings

Every week, over 130,000 motor vehicles and pieces of heavy machinery pass through Japan's premier automotive auction networks, including USS (Used Car System Solutions), TAA (Toyota Auto Auction), JU (Japanese Used Car Dealers Association), and ARAI. The global credibility of Japanese used vehicles stems directly from the rigor, independence, and transparency of these auction grading standards.

Unlike conventional used car marketplaces where individual sellers describe their own merchandise, Japanese auction houses employ professional, licensed vehicle inspectors. These inspectors examine every square inch of the automobile—including structural chassis members, roof panels, undercarriage rust, engine bay acoustics, and electronic diagnostics—and document their findings on a standardized Inspection Sheet (Tenkenhyo).

The overall auction score is the primary metric evaluated by international buyers and professional traders:

Overall Grade	Condition Definition	Target Buyer Profile
Grade S / 6	Brand new or showroom demonstrator condition. Less than 12 months old, under 10,000 km, flawless original exterior and interior.	Prestige buyers and buyers seeking as-new showroom units.
Grade 5	Near-mint condition with negligible cosmetic blemishes. Under 50,000 km, exceptionally well-preserved mechanicals and cosmetics.	High-end retail dealerships and discerning private importers.
Grade 4.5	Very high grade. Very light wear consistent with careful private ownership. Typically under 100,000 km with minor stone chips or pin dents.	The premier export standard: premium retail quality at excellent market value.
Grade 4	Good, honest condition. Normal wear and tear for vehicle age. Small scratches or dents that may be touched up; mechanically sound.	Most popular commercial export grade. Outstanding balance of price and reliability.
Grade 3.5	Average condition. Noticeable scratches, small dings, or interior wear. Higher cumulative mileage (frequently 120,000 km+). Mechanically roadworthy.	Budget-conscious buyers, fleet operators, and commercial utility fleets.
Grade 3	High wear. Prominent body scratches, paint fade, interior soiling, or mechanical items requiring servicing.	Reconditioning specialists and budget commercial utility users.
Grade R / RA	Accident history with structural or panel repair. Ranges from minor radiator support replacement (RA) to major frame straightening (R).	High-yield commercial traders capable of assessing structural repair diagrams.

Complementing the overall numeric grade, inspectors assign independent letter grades evaluating the passenger cabin and cosmetic exterior:

• Grade A (Interior / Exterior): Exceptional, like-new condition. No cigarette burns, no upholstery tears, pristine dashboard, no headliner sagging. Exterior finish is brilliant with zero clear-coat degradation.
• Grade B (Interior / Exterior): Clean standard condition. Minimal wear on steering wheel rim or driver seat bolster. Faint scuffs or slight fading acceptable for age. Completely acceptable for retail presentation without re-trimming.
• Grade C (Interior / Exterior): Noticeable interior wear. May contain cigarette smell, small burn marks, dashboard sticky residue, minor upholstery tears, or pet hair. Exterior displays visible paint scuffs or small paint touch-ups.
• Grade D (Interior / Exterior): Heavy interior soiling, persistent odor, significant seat tears, missing trim pieces, or severe exterior sun fade requiring full respray.

On every auction sheet, a two-dimensional schematic of the car displays standardized alphanumeric codes noting exact defect locations and severity levels (ranging from 1 to 3, where 1 is minor and 3 is severe):

Symbol	Meaning	Inspector Interpretation
A1 / A2 / A3	Scratch (Asuri)	A1 is faint surface scratch buffable by hand; A2 is through clearcoat; A3 is deep scratch requiring respray.
U1 / U2 / U3	Dent (Umi)	U1 is minor door ding without paint break; U2 is visible dent; U3 is deep, wide dent requiring panel beating.
W1 / W2 / W3	Repair Wave / Paint Repair	W1 is expert invisible paintwork; W2 is noticeable repair wave under light; W3 is poor color match or orange peel.
S1 / S2 / S3	Rust / Corrosion (Sabi)	S1 is superficial surface rust; S2 is moderate localized corrosion; S3 is severe corrosion or perforation.
X / XX	Panel Replacement	X denotes panel requiring replacement; XX denotes panel that has already been replaced with a new part.

Auction sheets feature handwritten Japanese shorthand written by inspectors in high-pressure testing bays. Non-Japanese speakers who rely on automated image translation often miss critical warnings regarding oil leaks, transmission shudder, suspension noise, or title mileage discrepancies.

At Nihon Shokai Co., Ltd. (Secondhand Dealer License No. 123010001221, Asahikawa, Hokkaido), our certified bilingual staff reads and translates the raw handwritten inspector notes before placing your bid. We verify whether the car has true odometer records, confirm whether tires are seasonal winter or summer treads, and advise you objectively on realistic resale value.