P226AWater in Fuel Lamp Control Circuit
- Generic OBD-II code · Powertrain
- How the car detects it
- P226A concerns the output that switches the water-in-fuel warning lamp, not the sensor. The control unit drives the lamp circuit and checks it electrically; an open lamp, a broken wire or a shorted driver lets it set this code. No manufacturer documents P226A publicly, and on current vehicles the cluster usually receives the warning as a bus message, so a discrete lamp line that could fail is found mainly on older or commercial diesels. The practical risk is that the driver is no longer warned when the separator fills, while the sensor itself keeps working and P2269 can still be stored. CARB treats the warning lamp as part of the driver information, not as an emission input, so this code normally does not turn on the MIL. Check bulb, socket, wiring and driver output.
- What you may notice
- Water-in-fuel lamp does not light during the bulb check at ignition on
- Lamp stays on permanently regardless of the filter state
- Likely causes
- LikelyBurnt-out warning lamp or corroded lamp socket
- PossibleOpen or shorted wire between control unit and lamp
- RareFaulty lamp driver in the control unit
- Repair
- Easy · Often possible to do yourself.Typical cost: €10 – €250
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.