Which OBD2 scanner do I need?
Answer three questions to separate an engine-code reader from an enhanced-system scanner or a bidirectional diagnostic tablet. The result uses products already researched and ranked by DriveScored; it does not infer make/model coverage.
The only genuinely bidirectional tool we evaluated: the MK808S reads every major module (engine, transmission, ABS, TPMS, BCM), runs 3,000+ active component tests and handles 28+ reset services on a dedicated Android tablet. Overkill for a check-engine light, right at home for a serious DIYer or side-shop. Note this is the S revision — the original MK808 is the older, shallower tool and is what most stale round-ups still link.
Compatibility and system access vary by make, model, year and trim. Confirm the exact coverage list before buying.
Want to inspect every capability row first? Open the ranked OBD2 scanner comparison or read BlueDriver vs Autel MK808S.