P0148
Fuel Delivery Error
Fuel quantity actually delivered does not match the commanded value over a long observation window. Mechanical issue in the fuel system.
- Check engine light: Yes
- Emissions related: Yes
- Repair difficulty: hard
Common causes
Ordered by how often each turns out to be the cause.
- HP pump wornCommon
Parts involved
- High Pressure Fuel Pump
- Fuel Injectors
P0148 is a generic OBD-II code defined by SAE J2012. Exact wording and diagnostic procedure vary by manufacturer and model. Code definitions are drawn from the public-domain OBDex dataset; the workshop notes are our own.