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• Reads every fault code the car will give up Stored, pending and permanent codes, and the module's own fault memory — where a code like P1000 hides from apps that only ask the usual way.
• Explains them without a connection Nearly two thousand explanations ship inside the app. A car park under a building is where diagnostics usually happen, and that is where it has to work.
• Clears codes, and says whether they stayed cleared A code that comes straight back is the useful answer, and the app tells you which ones did.
• Watches live readings and records them Coolant, revs, fuel trim, sensor voltages — as a dashboard while you drive, and as a recording you can look at afterwards.
• Sends a report anyone can read One document, with or without your workshop's own name and logo on it, as HTML or PDF.

Every explanation the app carries, on the web: what a code means, what usually causes it and what to check first.

No account, no analytics of its own, and no server of ours. Everything it reads from your car is stored on the phone, encrypted, and leaves only inside a file you send yourself. The app is free and is paid for by advertising, which appears in two places — the code dictionary and the history list — and never while a car is being read. It asks before using your advertising ID, and you can say no.