Privacy policy

Last updated 13 November 2026

Fehlerfrei is an Android app that reads diagnostic information from a car through a Bluetooth OBD-II adapter. This policy covers the app and this website. In short: the app collects nothing about you, and what it reads from your car stays on your phone.

What the app reads from your car

When you connect, the app can read fault codes, the check-engine lamp status, live sensor values, the adapter’s name and firmware text, and the vehicle identification number (VIN) if the car provides it. This is shown on screen so you can use it. It is not sent to the developer or to anyone else, and the app does not keep a history of it.

What the app stores on your phone

• Your chosen car profile.
• The Bluetooth address of the adapter you last used, so it can be listed first next time.
• Which live values you chose to show.

These settings stay in the app’s private storage and are removed when you uninstall the app or clear its data.

Permissions

• Nearby devices (Bluetooth) is used only to list the adapters you have already paired and to talk to the one you pick. The app does not scan for other devices and does not use Bluetooth to work out your location.

The app does not ask for your location, contacts, camera, microphone or files.

No accounts, ads or tracking

There is no sign-in. The app contains no advertising, no analytics and no third-party tracking code, and it makes no network requests of its own. Links in the app to this website and to the support email open in your browser or mail app.

Google Play

If you install the app from Google Play, Google may collect install, crash and diagnostic information under its own privacy policy. The developer sees that information only in aggregated form.

This website

This site uses no cookies, analytics or advertising. It is hosted on Cloudflare, which keeps standard technical logs, such as IP address and requested page, to deliver the site and protect it from abuse.

Email

If you write to support@fehlerfrei.app, your address and message are used only to reply to you.

Children

The app is a car diagnostics tool and is not directed at children. It collects no personal data from anyone.

Changes

If this policy changes, the new text will be published on this page with a new date.

Contact

Questions: support@fehlerfrei.app.