Water in Fuel Indicator
Indicates water contamination in the fuel system.
Heads up: this code wasn't in our hand-written library yet, so DiagCoach AI built this page on the fly. Double-check critical specs against service info before condemning parts.
What it means (plain English)
The engine's computer sees moisture in the fuel tank that can cause performance issues or engine damage.
What the computer is actually seeing
The control module monitors the water sensor in the fuel system for high water levels, usually over 50% contamination.
What a healthy reading looks like
Sensor should indicate less than 0.5 volts (dry) versus over 2.5 volts (high water content).
Guided diagnostic — the DiagCoach way
Don't just throw parts at it. Walk through these in order — each step tells you whether to keep going or stop and fix what you found.
- 11. Check the wiring and connector for the water sensor for corrosion or damage. If damaged, repair or replace it.
- 22. Inspect the fuel tank for water or dirt. If you find water, drain and clean the tank and replace the fuel filter.
- 33. Test the water sensor: Disconnect the sensor and check for the voltage output with a multimeter. Expect low voltage (less than 0.5V) if no water is present. If it reads high (over 2.5V), replace the sensor.
- 44. Clear the code and run the engine to monitor the sensor output again for changes. If the code returns, replace the contaminated fuel.
Common causes
- Faulty water sensor
- Contaminated fuel
- Poor fuel filtration
- Tank leaks or condensation
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
Moderate severity means you can drive, but it’s best to fix it soon to avoid engine damage.
Will this code come back after I clear it?
If the cause isn't fixed, yes, the code will return.
Why does it pair with SPN 2211?
SPN 2211 is often related due to both codes dealing with fuel quality, indicating a common source of contamination.
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