To find it:
1. Locate the valve cover: This is a somewhat rectangular part on top of the engine. It's usually made of aluminum or plastic.
2. Look for a small hose: emanating from the valve cover. This hose is usually relatively thin and made of a flexible material.
3. Trace the hose: Follow the hose; it will typically run towards the intake manifold (a large part of the engine where air enters). The other end connects to a port on the intake manifold, often near the throttle body.
4. Check near the throttle body: If you can't easily find the hose coming directly from the valve cover, it might be routed a bit more circuitously and you may need to trace it from a connection point near the throttle body back to the valve cover.
Important Note: Pictures of a 2003 Ford Focus engine bay with the PCV hose clearly labeled are readily available through online searches (Google Images, YouTube, etc.). Searching for "2003 Ford Focus PCV hose location" will likely yield the most helpful results visually. It's strongly recommended to use these visual aids to pinpoint the hose's exact location on your specific engine.
