01249–01256 Fuel Injector Cylinder 1 (N30) - Malfunction
The ECU sees a problem in this circuit but cannot narrow it to a specific short or open. Start at the connector and the wiring before condemning the part.
Can you drive it? This class of fault can cause real mechanical damage if you keep driving on it. A persistent misfire also destroys the catalytic converter, which is the expensive part.
Which code is which
Same fault, different cylinder or bank — diagnosed the same way. Several set together usually means one shared cause.
| Code | Definition | Severity |
|---|---|---|
01249 | Fuel Injector Cylinder 1 (N30) - Malfunction | Do not keep driving |
01250 | Fuel Injector Cylinder 2 (N31) - Malfunction | Do not keep driving |
01251 | Fuel Injector Cylinder 3 (N32) - Malfunction | Do not keep driving |
01252 | Fuel Injector Cylinder 4 (N33) - Malfunction | Do not keep driving |
01253 | Fuel Injector Cylinder 5 (N83) - Malfunction | Do not keep driving |
01254 | Fuel Injector Cylinder 6 (N84) - Malfunction | Do not keep driving |
01255 | Fuel Injector Cylinder 7 (N85) - Malfunction | Do not keep driving |
01256 | Fuel Injector Cylinder 8 (N86) - Malfunction | Do not keep driving |
The definition
01249: Fuel Injector Cylinder 1 (N30) - Malfunction.
What to check first
Cheapest and fastest checks first:
- Read the freeze-frame data stored with the fault - engine speed, load and temperature at the moment it logged tell you whether this happens cold, hot or under load.
- Check the connector at the part for corrosion, and that it is fully seated.
- Clear the code and see whether it returns, and under what conditions.
Reading the code is the easy part
A code names the circuit that complained. What tells you why is watching the sensor behind it while the engine runs — and that is where a code reader stops and a diagnostic tool starts.
VAGPULSE reads every module in a VW, Audi, Skoda or SEAT — not just the engine — shows the live measuring blocks behind this fault, gives you the freeze-frame conditions it was logged under, and clears it once you have fixed it. It also does what a generic OBD reader cannot on a VAG: service resets, coding, adaptations, and Stage 1–3 flashing with your original file saved first.
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Common questions
What does 01249 mean?
01249 means Fuel Injector Cylinder 1 (N30) - Malfunction. The ECU sees a problem in this circuit but cannot narrow it to a specific short or open. Start at the connector and the wiring before condemning the part.
Can I drive with 01249?
This class of fault can cause real mechanical damage if you keep driving on it. A persistent misfire also destroys the catalytic converter, which is the expensive part.