What does P1140 mean on a Ford?

P1140. Water In Fuel Condition (Diesel). Applies to F-250/F-350 Super Duty with Power Stroke diesel.

What causes P1140 on a Ford?

Water contamination in the fuel tank Infrequently drained filter housing Fueling from a contaminated source Failed filter element passing water Faulty sensor falsely reporting water

How do I fix P1140 on a Ford?

Drain the filter housing immediately. Water kills injectors Replace the fuel filter Sample tank fuel for contamination Refuel from a trusted high-turnover station Verify the sensor reads clear after service

Code

P1140

Water In Fuel Condition (Diesel)

Category: Powertrain - Fuel/Air Metering
Severity: Check Engine Light
Applies to: F-250/F-350 Super Duty with Power Stroke diesel
Related: No single generic twin. See OBD Codes List

Findings, check these first

Water contamination in the fuel tank
Infrequently drained filter housing
Fueling from a contaminated source
Failed filter element passing water
Faulty sensor falsely reporting water

Standard procedure

Drain the filter housing immediately. Water kills injectors
Replace the fuel filter
Sample tank fuel for contamination
Refuel from a trusted high-turnover station
Verify the sensor reads clear after service

Code lookup

Type a code above, or start from a symptom or a common code.

Press / to jump to the box. Ford-enhanced powertrain, body, chassis and network codes. Generic P0xxx codes live on OBD Codes List.

Sources and review

Review: qualified. Read the source limits below.

OBDII.pro: P1140 Ford definition
live reference page (obdii.pro)
Supports: Ford-family meaning for P1140: Water In Fuel Condition
Fetched directly. obdii.pro is a publisher independent of the engine-codes family.

Last updated 2026-09-20.

Report a correction for P1140. Include your vehicle, the issue and a source if you have one.