P0313Misfire Detected with Low Fuel
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Needs a drive cycle to confirm a fix
- How the car detects it
- When the tank is nearly empty the fuel pump can draw air in corners or on gradients, which causes misfires. CARB allows misfire detection to be switched off at 15 % fuel or less; some manufacturers instead report misfires detected in this state under P0313 rather than P030x. Ford's normal misfire monitor runs from 15 % fuel, Saab's ME9 from 12 %; Saab's T8 sets P0313 below 5 litres with the same tests as P0300 (3 % per 1,000 revolutions, flashing light at a catalyst-damaging rate). GM petrol engines simply suspend the monitor without their own code. After refuelling the symptoms usually disappear – if not, look for a real misfire cause.
- What you may notice
- Check engine light on (flashing at a catalyst-damaging rate)
- Jerking or power loss with an almost empty tank, especially in corners or uphill
- Usually no symptoms after refuelling
- Likely causes
- LikelyTank nearly empty – the fuel pump draws air (corners, gradients, braking)
- PossibleActual misfire cause (ignition, injector, false air) that happened at low fuel
- PossibleWeak fuel pump, clogged strainer or filter, faulty swirl pot
- RareFuel level sender reading too low
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Easy · Often possible to do yourself.Typical cost: €0 – €600
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.