P1325–P1332 Cylinder 1 Knock Control: Limit Attained
The engine computer has pulled the ignition timing on this cylinder as far as it is allowed, to stop knock (pinking). Poor fuel, carbon build-up, a loose knock sensor or a mechanical noise can all cause it.
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 |
|---|---|---|
P1325 | Cylinder 1 Knock Control: Limit Attained | Do not keep driving |
P1326 | Cylinder 2 Knock Control: Limit Attained | Do not keep driving |
P1327 | Cylinder 3 Knock Control: Limit Attained | Do not keep driving |
P1328 | Cylinder 4 Knock Control: Limit Attained | Do not keep driving |
P1329 | Cylinder 5 Knock Control: Limit Attained | Do not keep driving |
P1330 | Cylinder 6 Knock Control: Limit Attained | Do not keep driving |
P1331 | Cylinder 7 Knock Control: Limit Attained | Do not keep driving |
P1332 | Cylinder 8 Knock Control: Limit Attained | Do not keep driving |
The definition
P1325: Cylinder 1 Knock Control: Limit Attained.
P1325 is a manufacturer-specific powertrain code (the engine or gearbox). Its meaning is set by the carmaker rather than by the SAE standard, so a generic OBD-II reader will often show it as an unknown code or misread it.
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 your engine ECU's fault codes and the live measuring blocks behind them, and clears the codes once you have fixed the fault. On the engine it also does what a generic OBD reader cannot on a VAG: coding, adaptations, and Stage 1–3 flashing on Bosch ME7 petrol ECUs, with a backup saved every time it reads your ECU.
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Common questions
What does P1325 mean?
P1325 means Cylinder 1 Knock Control: Limit Attained. The engine computer has pulled the ignition timing on this cylinder as far as it is allowed, to stop knock (pinking). Poor fuel, carbon build-up, a loose knock sensor or a mechanical noise can all cause it.
Can I drive with P1325?
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.