Definition
OBD-II ports allow scan tools to read codes and live data.
Emissions-related codes must be addressed for street legality in many regions.
Automotive Wiki
Electronics
OBD-II
On-board diagnostics standard providing standardized trouble codes and sensor data access.
Related terms
- ECUEngine control unit — the computer managing fuel, ignition, and emissions parame…
- MAP SensorManifold absolute pressure sensor reporting boost or vacuum to the ECU.
- MAF SensorMass airflow sensor measuring incoming air mass for fuel delivery calculations.
- Knock SensorA sensor detecting engine knock (detonation) so the ECU can retard timing.
- CAN BusController area network — the digital communication backbone linking vehicle mod…
- Wideband O2 SensorA high-accuracy oxygen sensor reporting precise air-fuel ratio for tuning.
Category: Electronics · Updated August 31, 2026