P1404 - EGR Position Sensor Rationality Closed
- The Technical Definition: The Exhaust Gas Recirculation (EGR) position sensor is reading rationally closed, meaning the valve may be stuck or not functioning properly.
- Common Symptoms: This will trigger a check engine light and sometimes even contribute to secondary misfire codes.
- Typical Fix: Replacing the EGR valve is the standard fix for this issue.