A 2000 Ford Expedition failing a smog test due to “Not Ready” status for the catalytic converter and EVAP system is a common issue. This status indicates that the vehicle’s onboard diagnostic system (OBDII) hasn’t completed its self-tests for these components. Understanding why this happens and how to resolve it is crucial for passing smog.
Understanding the “Not Ready” Status
The OBDII system continuously monitors various emission control components, including the catalytic converter and evaporative emissions (EVAP) system. When a component’s monitor hasn’t completed its diagnostic cycle, it displays a “Not Ready” status. This doesn’t necessarily indicate a malfunction but rather insufficient data for the system to determine functionality. Several factors can trigger this:
- Recently Cleared Codes: If OBDII codes have been recently cleared, the monitors need to run again.
- Disconnected Battery: Disconnecting the battery resets the OBDII system, requiring monitors to re-run their cycles.
- Insufficient Driving: Specific driving conditions, known as drive cycles, are necessary for the monitors to complete their tests. Without sufficient driving that meets these parameters, the monitors remain “Not Ready.”
Drive Cycles for Catalytic Converter and EVAP System
Each monitor has specific drive cycle requirements. For a 2000 Ford Expedition, these generally include:
Catalytic Converter:
- Ensure the oxygen sensor monitor has run successfully.
- Drive in stop-and-go traffic, varying speeds between 25-45 mph for at least 10 minutes. Incorporate five distinct cruising speeds within this range.
EVAP System:
- Maintain a fuel tank between one-half and three-quarters full.
- Cruise at a steady speed between 45-65 mph for approximately 10 minutes.
- Avoid sharp turns, rapid acceleration, and steep hills during the drive cycle.
It’s important to consult the vehicle’s owner’s manual for the precise drive cycle instructions, as they may vary slightly.
Troubleshooting “Not Ready” OBDII Status
If completing the drive cycles doesn’t resolve the “Not Ready” status, further troubleshooting may be required:
- Check for Pending Codes: Pending codes indicate a potential issue that hasn’t yet triggered a Check Engine Light. Addressing these codes may resolve underlying problems preventing monitor completion.
- Inspect for Leaks (EVAP): The EVAP system is designed to prevent fuel vapor leaks. Inspect for damaged hoses, loose connections, or a faulty gas cap.
- Verify Oxygen Sensor Functionality: A malfunctioning oxygen sensor can prevent the catalytic converter monitor from running.
- Consider Professional Diagnosis: If the issue persists, consulting a qualified mechanic with a professional OBDII scan tool is recommended. They can diagnose potential problems hindering monitor completion, such as a faulty catalytic converter or EVAP system component. Using “cat cleaner” is unlikely to resolve underlying mechanical or electrical issues.
Passing Smog with “Not Ready” Status
While some states allow a limited number of “Not Ready” monitors for a smog test, California typically requires all monitors to be ready. Failing to achieve “Ready” status will likely result in a failed smog test. Therefore, addressing the underlying cause of the “Not Ready” status is crucial for passing.
Conclusion
Addressing a “Not Ready” OBDII status on a 2000 Ford Expedition requires understanding the drive cycle requirements and performing thorough troubleshooting. Completing the correct drive cycles is often the solution. However, persistent “Not Ready” status may indicate underlying issues that require professional diagnosis and repair. Addressing these issues is essential for passing smog tests in California and ensuring the vehicle operates efficiently and within emissions standards.
