OBD Vault reads vehicle data through a compatible ELM327 Bluetooth Low Energy (BLE) OBD-II adapter. An adapter and a vehicle are required for live readings and new scans. Wi-Fi and Bluetooth Classic adapters are not supported. Available readings depend on your vehicle, ECU and adapter.

SCAN AND UNDERSTAND
Read confirmed, pending and permanent diagnostic trouble codes, supported sensor readings and emissions readiness information. Review stored freeze-frame data when the ECU provides it. Code explanations and suggested checks are guidance; they do not identify a confirmed root cause or certify that a vehicle is safe to drive.

LIVE DATA AND TRIPS
View supported live readings such as engine RPM, speed and coolant temperature. Record trips, review distance and sensor history, and keep diagnostic scans separate from trip records. View ECU-reported fuel flow when supported, or an estimate when the required readings and fuel profile are available. Recalculate estimated fuel use for saved trips when the necessary sensor history was recorded.

VEHICLE PROFILE
When VIN is unavailable, optionally select your make, model and engine before your first scan. Search an offline catalog of 433 makes and 10,871 models. Engine choices are tied to the selected model and show capacity, fuel and available power. Manual entry remains available for missing variants.

YOUR HISTORY, OFFLINE
Save scans and trips on your phone without an account. Review history and export your records. Clearing fault codes is a separate manual action that requires confirmation and shows the ECU response.

OPTIONAL CLOUD AND AI ACCESS
Sign in to synchronize saved vehicle records across devices. With active AI access, connect a supported external assistant to your saved data through Model Context Protocol (MCP). Claude is supported; the ChatGPT connector is under review and is not yet generally available. The mobile app does not run an AI model. The connector cannot send commands to your vehicle.

OBD Vault supports standard OBD-II diagnostics. It does not provide comprehensive manufacturer-specific diagnostics, ECU coding or active tests. It is not a replacement for inspection or advice from a qualified technician.

Vehicle data by VehiclesDB (vehiclesdb.com). Additional source data: FuelEconomy.gov (DOE/EPA) and European Environment Agency.