Repairing P1405 involves systematically checking several components:
1. Check the PCV Valve: This is the most common culprit. The PCV valve is responsible for venting crankcase pressure. A clogged or malfunctioning PCV valve can disrupt the EGR system's operation and trigger this code.
* How to check: Locate the PCV valve (usually a small valve with a hose attached near the valve cover). Remove it and inspect it. It should have a small spring inside and should be able to move freely. Try blowing through it; air should pass easily in one direction but be blocked in the other. If it's clogged or stuck, replace it.
2. Inspect the PCV Hose(s): Check all vacuum hoses connected to the PCV system for cracks, leaks, or kinks. Replace any damaged hoses. Make sure they are securely attached to both the valve and the intake manifold.
3. Examine the EGR Vacuum Solenoid: This solenoid controls the flow of vacuum to the EGR valve. A faulty solenoid can prevent proper EGR operation, leading to the P1405 code.
* How to check: You'll likely need a multimeter to test the solenoid's resistance (check your Ford Windstar's repair manual for the correct resistance values). You can also visually inspect it for any damage. A replacement is relatively inexpensive.
4. Inspect the EGR Valve (Indirectly): While the code isn't directly pointing to the EGR valve, a severely clogged or sticking EGR valve *can* indirectly cause problems that lead to the P1405 code. So, it's a good idea to check it if the other steps don't resolve the issue. Cleaning or replacing the EGR valve might be necessary if it's severely fouled. However, cleaning it won't resolve a P1405 if the PCV system is the actual problem.
5. Check for Vacuum Leaks: A leak in the vacuum system anywhere between the PCV valve and the EGR valve can disrupt the system's operation. Inspect all vacuum lines and connections carefully.
6. Check the PCM (Powertrain Control Module): In rare cases, a faulty PCM can cause this code. This is usually the last thing to check and is generally much more involved and expensive to fix.
Important Considerations:
* Repair Manual: Consult a repair manual specific to your 2000 Ford Windstar. It will provide detailed diagrams, specifications, and troubleshooting steps.
* Safety: Disconnect the negative battery terminal before working on any electrical components. Exhaust gases are hot and toxic; be careful when working near the exhaust system.
* Professional Help: If you are not comfortable working on your vehicle's electrical or vacuum systems, it's best to take it to a qualified mechanic.
By systematically checking these components, you should be able to pinpoint the cause of the P1405 code and repair it. Remember to clear the code using an OBD-II scanner after making repairs to see if the problem is resolved.
