FIELD-READY EVIDENCEPreserve the story
before it changes.
Six practical checklists for the moments when a missed condition, cleared code, wrong adapter, wrong part, or incomplete verification gets expensive.
- Screen for unsafe operation, heat, smoke, fuel odor, fluid loss, severe vibration, brake/steering/restraint warnings, or high-voltage damage.
- Record the exact complaint, warning behavior, date/time, mileage, weather, temperature, fuel/charge level, and recent work.
- Record adapter, firmware, phone/platform, app build, protocol, and connected controllers.
- Save stored, pending, and permanent codes with status and reporting module.
- Save readiness, freeze frame, Mode $06 availability, and relevant live-data baseline.
- Mark unavailable modules and signals as unavailable—not clear or zero.
- Export or photograph the evidence before any reset.
- Key state, start/drive time, cold or hot soak, rain/wash exposure, road surface, turn, braking, acceleration, accessories, and charging state.
- Exact warning messages, sounds, odors, vibration, control changes, duration, and what restored operation.
- Current, pending, history, low-voltage, and communication codes across every accessible module.
- A focused hands-free trace of signals that separate the leading hypotheses.
- Physical inspection notes before moving connectors or harnesses.
- Event-to-event comparison and any contradicting evidence.
- Physical VIN, documents, title/history source, recalls, service records, and cold-start availability.
- Warning-lamp bulb check and all available module scans before the road test.
- Stored, pending, permanent, readiness, freeze-frame, voltage, and reported-VIN evidence.
- Independent inspection of structure, leaks, tires, brakes, steering, suspension, cooling, fluids, corrosion, and prior repairs.
- Road-test observations and a permitted post-drive rescan.
- Hybrid/EV, exotic, or high-value specialist review using exact application access.
- Written list of inaccessible systems and unresolved questions.
- Exact phone/Windows platform and supported transport: BLE, Wi-Fi, approved Classic path, USB, Ethernet, J2534, or other VCI driver.
- Exact hardware model, revision, firmware, driver, cable, and electrical requirements.
- Exact vehicle application, protocol, module, and read or command function needed.
- Required profile, licensed definition, OEM subscription, secure-gateway account, or provider authority.
- Independent support evidence for the exact configuration—not a brand-wide badge.
- Return policy, firmware support, vendor identity, and counterfeit risk.
- Exact vehicle application, production date, engine/transmission/drivetrain, market, and relevant option codes.
- Trusted catalog anchor with brand, manufacturer part number, position, qualifiers, and exclusions.
- Marketplace listing matches exact brand and printed manufacturer part number.
- Condition, quantity, actual photos, seller record, returns, warranty, shipping, tax, core, and delivery reviewed.
- Dealer/local and online delivered-total comparisons use the same identity.
- Final listing and policy rechecked immediately before purchase.
- Original complaint and pre-repair evidence attached.
- Exact repair, part numbers, software/calibration identifiers, fluids, setup, coding, registration, or relearn documented.
- Original failure conditions repeated safely with comparable signals.
- Current and pending channels remain clear of the target fault under the test window.
- Relevant readiness monitor and permanent-code state recorded.
- No new related code, warning, leak, noise, or control issue introduced.
- Unavailable tests, incomplete monitors, deferred work, observation window, and safety restrictions disclosed.
