P2264

Water in Fuel Sensor A Circuit

Fuel & air metering Generic OBD-II Medium

What it means

P2264 sets when the engine computer sees an electrical fault in the water-in-fuel sensor circuit, usually a sensor in a diesel fuel filter or water separator. The engine typically still runs normally, but the system that warns you of water in the fuel is not reporting correctly, which is worth fixing before water reaches the injection system.

Medium

Can I keep driving? Usually drivable, but the sensor that warns of water in the fuel is offline — get it checked before water can reach and damage injection parts.

Real-world scan data

Seen in

3,887

scans in the past year

Found in

0.6%

of scans

1.1%

of scans that found faults

Appears alongside · share of P2264 scans

P0683in 38.0% of scans

P0110in 30.9% of scans

P0100in 25.4% of scans

Figures reflect only diagnostic scans recorded through our own apps and tools. Cars are typically scanned because a symptom or warning light prompted it, so these counts describe our scan records — not the incidence of faults in any model, and not the quality, reliability, or safety of any vehicle. No comparison between manufacturers or models is implied. All trademarks belong to their respective owners; no affiliation or endorsement is implied.

Common symptoms

What you'll notice

Check-engine light on
Water-in-fuel warning light may stay on or fail to work
Often no noticeable change in how the vehicle drives

Common causes

Most likely first

Corroded, loose, or damaged connector at the water-in-fuel sensorLikely
Open or shorted wiring between the sensor and the moduleCommon
Failed water-in-fuel sensor (commonly in the fuel filter housing)Common
Actual water accumulation in the fuel filter/separatorLess often
Failed PCM/ECM (rare)Less often

How to diagnose & fix

Work through it in order

Read freeze-frame data, then inspect the sensor connector at the fuel filter/water separator for corrosion or moisture.
Check the wiring and ground for opens, shorts, and chafing back to the module.
Drain the fuel filter/water separator if a drain is fitted.
Compare the sensor's signal to spec; replace the sensor if it is out of range.
Clear the code and re-test; suspect the module only after wiring and sensor check out.

FAQ

Quick answers

Is it safe to drive with P2264?+

Short trips are usually fine, but the code means the sensor guarding against water in the fuel is not reporting. Water in diesel fuel can damage the injection system, so have it diagnosed soon.

Can I just clear P2264?+

You can, but it returns unless the wiring, connector, or sensor is repaired. Clearing it also hides a genuine water-in-fuel warning.

Read & clear P2264 yourself

Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.

▶ Get it on Google Play

✓ Verified name — SAE J2012 / ISO 15031-6Guidance reviewed by OBD DashX