Free, no app, no account. Works on your phone, in your language.
Black, blue or white smoke means wasted fuel, a damaged engine and dirty air for everyone around you. Many causes are cheap to fix, such as a clogged air filter or a loose hose.
Mechanics and diesel injection specialists get step-by-step tests, and the AI helps read scanner screens and compression readings.
Free guidance, not a substitute for a mechanic. We tell you when to see one.