P0148Fuel Delivery Error
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- P0148 is an early, rather unspecific OBD II code: the control module finds that the fuel delivered does not match what was requested. Saab's 3.0 V6 diesel (Isuzu) uses it for leak detection: from the balance of quantity and rail pressure it recognises a leak of 90 mm³ per crankshaft revolution, monitored continuously up to 6,400 rpm, and then shuts the engine off – a restart is only possible in the next drive cycle. Ford lists P0148 in the fuel monitor of its 2020–2023 petrol engines, alongside P0171/P0172, without describing the logic. Newer systems usually report such faults more precisely as P0087/P0088 (rail pressure) or P0093 (large leak).
- What you may notice
- Check engine light on
- Engine stalls or will not restart (Saab: shut-off until next drive cycle)
- Loss of power, stumbling
- Fuel smell with an external leak
- Likely causes
- LikelyFuel leak in the high-pressure or return section (line, rail, injector leakage)
- PossibleFuel filter clogged or lift pump weak
- PossibleHigh-pressure or injection pump worn
- RarePressure or volume control valve faulty
- RareAir in the fuel system (tank run dry)
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Hard · Usually a job for a workshop.Typical cost: €50 – €2,500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.