Vehicle diagnostics for people who already know what a DTC is.

See the exact row count, source versions, systems, sub-functions and qualifiers behind one vehicle/function page.

Compare the stored evidence set with adjacent model years without pretending that a database delta proves a hardware change.

Surface CAN FD, DoIP and related access considerations when the current make/year rules flag them, then verify the exact module path.

Treat bidirectional control as an experiment: command, observe scan feedback, and independently verify the physical output when needed.

Know when scan data has reached its limit and the next proof should come from voltage drop, current, pressure, waveform or network testing.

Show the coverage source version and publisher behind stored exact rows so a professional can judge the evidence instead of trusting a badge.