Define the buyer’s real question
Use static measurements and a controlled road test to separate tyre, alignment, suspension, steering and bearing symptoms on the selected VIN.
Record destination, intended registration, steering side, daily and long-distance route, passengers, luggage, charging access, accepted powertrain, new or used condition, budget and delivery point. A changed candidate or destination reopens affected checks.
Apply the model-specific test
A quiet low-speed demonstration cannot represent highway noise, rough-road control or loaded family use. Start with tyre pressures and wheel condition, inspect accessible joints and mounts, then map each symptom by speed, steering angle, braking and road surface. Never diagnose a wheel bearing solely from a cabin recording.
Combine this route with tyre and wheel evidence, the complete UNI-Z inspection and structural repair checks.
Run the complete evidence sequence
Static condition gate
Record ride height, tyre markings and pressure, tread, rim damage, leaks, boots, bushes, joints, springs, dampers, mounts and accessible underbody points. Unsafe looseness, damage or leakage stops the road test.
Alignment evidence
Compare steering-wheel position, tyre wear and measured alignment where justified. A printout without VIN, date, tyre condition and before-or-after status is weak evidence.
Controlled road sequence
Use safe legal conditions for parking turns, low-speed roughness, steady speeds, acceleration, lift-off and progressive braking. Record surface, load and temperature with each symptom.
Bearing and tyre separation
Change road surface, speed and gentle steering load where safe. Rotation-related noise can arise from tyre pattern, wheel, brake or bearing, so confirm with physical inspection and qualified diagnosis.
Repair and repeat
Identify the cause, parts and workshop, then repeat the same symptom condition and alignment or diagnostic checks. A replacement part does not close the issue without comparable evidence.
Arrival support
Price alignment, tyres, bearings, dampers, bushes and steering diagnostics at destination. Record unresolved noise or pull in the handover condition report.
Official context: Review the current Changan UNI-Z product page and match it to the selected vehicle.
Evidence specific to this decision
A quiet low-speed demonstration cannot represent highway noise, rough-road control or loaded family use. Start with tyre pressures and wheel condition, inspect accessible joints and mounts, then map each symptom by speed, steering angle, braking and road surface. Never diagnose a wheel bearing solely from a cabin recording.
Keep one VIN across the file
Inspection joins structure, paint, underbody, tyres, brakes, road behaviour, diagnostics and history to one VIN. PHEV candidates add battery enclosure, charging and high-voltage diagnostics; gasoline cars add cold-start and DCT tests.
Preserve original-language records beside translations. Connect photos, diagnostic output, charging or road tests, inspection, quotation and contract to the same VIN. Conflicts stop approval until resolved at source.
| Evidence | What to record |
|---|---|
| Identity | VIN, production plate, legal model, powertrain and version |
| Condition | Dated physical checks, history, diagnostics and test results |
| Compatibility | Destination consequence, limitation and responsible reviewer |
| Commercial | Seller, beneficiary, included work, validity and delivery term |
Inspection depth
Begin cold where applicable, then test low speed, cruise, acceleration, braking and uneven surfaces. Recheck leaks, warnings and diagnostics. iDD adds EV transitions and charging.
Record location, severity and repair consequence. Keep cosmetic, structural, mechanical, high-voltage and software issues separate.
Test an ordinary day and an adverse day
Use realistic passengers, luggage, weather, speed, gradients, traffic and energy availability. For iDD, include a failed charger and battery reserve. For gasoline, include local fuel, emissions and workshop constraints. A specification is context, not a guarantee of suitability.
Mark each conclusion green, amber or red with evidence date and owner. Amber needs a priced consequence or condition; red stops payment. Do not turn missing proof into a positive feature claim.
Preserve the approved vehicle to delivery
Carry VIN, version, condition and included work through quotation, contract, invoice, export records and loading media. Record odometer, fuel or charge state, keys, cables, accessories, faults and exterior condition at handover.
China-side work cannot promise destination tax, conformity, registration, charging access, software services, warranty, insurance or future reliability. Refresh local advice if vehicle, route or rules change.
Request a VIN-linked UNI-Z proposalDocuments that keep this decision usable
Create a candidate summary naming the VIN, production date, legal model, powertrain, version, odometer and seller. Attach original identity records, continuous dated media, inspection findings, diagnostic output, road-test notes and charging results where applicable. Each conclusion should identify its source, test condition, limitation, reviewer and expiry point.
Keep the commercial file separate but connected: dated quotation, included and excluded work, inspection conditions, contract entity, bank beneficiary, export responsibility, carrier acceptance and delivery boundary. The destination file records tax or duty advice, conformity, registration, insurance, energy access and workshop support. A changed input reopens the affected decision while preserving the audit trail.
Before loading, compare the approved summary with the physical vehicle and final documents. Record keys, cables, accessories, odometer, fuel or battery state, warnings and visible condition. This final comparison helps prevent a correct inspection being attached to the wrong car.
Buyer questions
Can uneven tyre wear prove an alignment fault?
It justifies further checks but does not identify the cause by itself.
Does a wheel-bearing sound always get louder in a turn?
Not reliably enough for purchase approval; combine controlled observations with physical diagnosis.
What closes a suspension concern?
A named cause, accepted repair and comparable VIN-linked retest with safe road behavior.