OBD‑II Basics
OBD‑II is a universal standard that lets your car share health and performance information. Car AI reads this data and explains it in simple language, so you always know what’s happening under the hood.
OBD‑II (On‑Board Diagnostics) is a standard present on almost all cars built since 1996. It defines a common port and a shared language that diagnostic tools use to access engine and emissions data.
When a warning light appears (like the check‑engine light), the vehicle stores one or more diagnostic trouble codes (DTCs). Reading those codes and related live data helps identify what needs attention.
Car AI connects through a small OBD‑II dongle (often ELM327‑compatible) that plugs into your car’s diagnostic port. Once paired, the app reads standardized PIDs (parameters) like engine speed, coolant temperature, fuel trims, and more.
Instead of just showing raw numbers, Car AI interprets them, correlates with DTCs if any, and explains what’s normal vs. concerning — in plain English.
- RPM & Load: Helps assess engine workload and idle behavior.
- Coolant Temp: Indicates warm‑up and possible overheating issues.
- Fuel Trims: Short/long‑term adjustments your ECU makes to fueling.
- O2/AFR Sensors: Feedback on combustion and catalytic converter performance.
- Speed & Throttle: Useful for driveability and efficiency insights.
Traditional scanners show codes like P0301 or P0420. Car AI goes further — it explains what those mean, how urgent they are, and suggests sensible next steps you can discuss with a mechanic.
You can simply ask: “Why is my check‑engine light on?” or “Is it safe to drive?” — and get an answer that considers your car’s current data.