Powertrain
generic / SAE
P238A
Water in Fuel Sensor B Circuit
A general circuit fault on the secondary water-in-fuel sensor B - typically used on diesel systems with two filter housings (pre-pump and post-pump). The ECU loses water-detection feedback on this stage; risk of water reaching the high-pressure pump and injectors.
SystemPowertrain
Typegeneric / SAE
GroupP2
Range / number3 / 8A
Possible causes
- Open in sensor or wiring high
Inspection / repair
- Difficulty: easy
- DIY: possible
- Estimated cost: 80–280 €
- Estimated time: 0.4–1.4 h
- Component: water in fuel sensor b
- Component: fuel filter housing b
- MIL / check engine light
Sources
References
sae:J2012