We're working on a fix — Diago should be back shortly. Thanks for your patience.
Diago
Instant AI vehicle diagnostics
Diago
Instant AI vehicle diagnostics
That orange glow can mean anything from a loose gas cap to a failing catalytic converter. The only way to know for sure is to diagnose it — and you don’t need to pay a shop $120 just to find out.
The most common trigger. A loose cap causes a fuel vapor leak that the EVAP system detects as a fault. Free to fix.
A bad O2 sensor causes the engine to run rich or lean. Fuel economy drops and emissions climb. Usually $150–$350 to replace.
If the cat is clogged or failing, code P0420 is the usual result. One of the pricier fixes: $300–$2,000 depending on vehicle.
Controls the air-fuel mix. A dirty or failed MAF causes rough idle, sluggish acceleration, and poor fuel economy.
Worn plugs or a dead coil cause misfires. A flashing check engine light often means an active misfire — address immediately.
Common on higher-mileage vehicles. Emissions-related codes that don’t always affect drivability but will fail an emissions test.
Tell Diago your vehicle, describe what you’re noticing, and get an instant diagnosis — likely cause, repair steps, and local shop prices. First 3 are free.
Diagnose my check engine light →A solid check engine light means a stored fault code. The car has detected a problem that needs attention but isn’t necessarily urgent right now. Schedule a diagnosis soon.
A flashing or blinking check engine light means an active engine misfire. Raw fuel is entering the exhaust and can destroy your catalytic converter in minutes. Reduce speed, avoid heavy acceleration, and get it checked immediately.
If the light is solid and the car drives normally, short trips are usually okay while you arrange a diagnosis. If it’s flashing, pull over as soon as it’s safe — an active misfire can cause expensive damage within miles.
Yes, with a cheap OBD-II scanner. But it will come back if the problem isn’t fixed. Clearing codes also resets emissions readiness monitors, which can cause you to fail a state inspection for weeks.
Most shops charge $100–$165 for a diagnostic scan before any repair. Diago gives you an instant AI diagnosis free for your first 3 vehicles, then $4.99 per diagnosis or $9.99/month for unlimited.
Yes — Diago supports cars, trucks, SUVs, motorcycles, ATVs, semi trucks, RVs, travel trailers, buses, boats, farm equipment, and more.