P1140: Water In Fuel Condition

What does P1140 mean?

P1140 is a diagnostic trouble code indicating "Water In Fuel Condition". This code relates to your vehicle's engine/powertrain and should be diagnosed to determine the root cause. The severity level helps indicate how urgently this should be addressed.

Symptoms you may notice

• Check engine light (MIL) illuminated on dashboard
• Poor fuel economy
• Rough idle
• Hesitation during acceleration

Common causes

• Faulty engine/powertrain component
• Wiring or connector issue in the related circuit
• Failed sensor providing incorrect readings
• Software/calibration issue requiring ECU update
• Related component causing secondary fault

What should you do?

This code sits in an engine peripheral, typically emissions or forced induction. It will not take braking or steering away, but it can put the car into limp mode, cost you fuel and fail a roadworthy. Book it in rather than clearing it and hoping.