Check your car's OBD status before smog and state inspection tests. Instantly view monitor completion for Catalytic Converter, EVAP System, Oxygen Sensors, and Heated O2 Elements.
Monitors catalytic converter substrate efficiency over highway drive cycles to verify exhaust conversion.
Tests fuel vapor pressure tight seal. Detects missing gas caps, cracked vacuum lines, or leaking purge valves.
Verifies lambda response times and internal heater coil circuits for upstream and downstream oxygen sensors.
Ensures Exhaust Gas Recirculation and Variable Valve Timing solenoids execute active diagnostic cycles.
Download OBDAssistant to perform a instant 10-second OBD status check before paying for inspection fees.
Check OBD Status FreeOBD status reflects the operational condition of your vehicle's emissions control systems. OBD2 readiness monitors indicate whether self-diagnostic tests for components like the catalytic converter, EVAP system, and O2 sensors have run to completion.
Monitors reset to incomplete whenever diagnostic trouble codes are cleared or the 12V battery is disconnected. Completing a standard OBD2 drive cycle clears incomplete status.