Urgency: Moderate
Water in Fuel Light (Diesel)
Investigate soon. Driving short distances is generally okay, but book a diagnostic check.
What the Water in Fuel Light (Diesel) Means
On your diesel your car, this symbol means the fuel filter's water trap needs draining. Left alone, water can corrode and destroy expensive high-pressure injection components.
Common Causes
- Water accumulated in the fuel separator
- Condensation in a low fuel tank
- Contaminated or poor-quality diesel
- Faulty water sensor
- Fuel filter overdue for service
How to Fix It
- Drain the water from the fuel filter/separator (per the manual)
- Avoid running the tank very low to reduce condensation
- Use reputable fuel stations
- Replace the fuel filter if overdue
- Check the water sensor if the light stays on after draining