OBD-II code · Powertrain (generic, extended)
P2266 Water in Fuel Sensor A Circuit Low
The water-in-fuel sensor at the diesel fuel filter reads below lower plausibility — short to ground. The sensor warns the driver to drain the filter when condensate accumulates.
Is it safe to drive with P2266?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyShort to ground
- Less likelyConnector pins corroded - high contact resistance
- Less likelyHarness chafing through insulation
Repair at a glance
- Difficulty
- Easy
- DIY friendly
- Often, with basic tools
- Typical labour
- 0.3–1.5 h
- Emissions test
- Usually unaffected
- Parts involved
- Water In Fuel Sensor, Fuel Filter
Related codes
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.