OBD Analyst: Car Diagnostics

OBD Analyst turns an inexpensive Bluetooth OBD-II adapter into a proper diagnostic instrument. It reads live engine data, records it, and then tells you what the numbers mean not just what they are. LIVE DATA Pick the channels you care about and arrange them by dragging the cards. Engine speed, coolant, manifold pressure, timing advance, fuel trims, oxygen sensors, battery voltage and more, alongside your phone's own GPS speed, altitude, acceleration and sound level. Channels are polled on deadlines rather than fixed priorities, so a slow-moving reading never starves a fast one. FAULT CODES Stored, pending and permanent diagnostic trouble codes, with readiness monitor status. Codes are explained where the standard defines them. GUIDED TEST CYCLE Some measurements need conditions an ordinary drive never produces a coldstart, a steady cruise in one gear, a clean coast-down. The guided cycle walks you through them step by step, and narrows polling to just the channels each step needs, so sensors are sampled fast enough to actually be measured. Entirely optional: most readings are picked up from ordinary recordings on their own. TRENDS OVER TIME OBD Analyst extracts vital readings from every recording, guided or not, and tracks them across drives. A cold idle speed that has crept up over two months is something no single session can show you. EXPORT Every recording exports as CSV for your own analysis, or as a self-contained HTML report you can keep or send to a mechanic. YOUR DATA STAYS YOURS OBD Analyst has no servers, no account, no analytics and no advertising. It makes no network requests at all. Recordings live in a database on your phone and go nowhere unless you export them yourself. WHAT YOU NEED • A Bluetooth Low Energy OBD-II adapter • A vehicle with an OBD2 port