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Listen to the engine and see if it actually has a knock or rattle to it.If it does then it is possible it is the petrol and it may need drained and filled with fresh petrol to resolve this.It may also be a fault with a mechanical fault in the engine like an engine bearing starting to fail or engine component failing needing replaced.You would have to have this looked into further to locate and repair this issue here.
If there is no engine noise at all then most likely it is only the knock sensor itself needing replaced.Knock sensor failure is common for this code here with the sensor needing replaced.
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Was the knock sensor replaced?
O.k. there in some cases will not be any change in behavior when the knock sensor is acting up.It may act up a few times but not cause any issues but can turn on the warning light and set this code.If you have no engine noises at all then I suspect the knock sensor needs replaced.