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How old is car what year model would you know the ECU calibration id like ZA1JA00G or similar
if your car is early calibration id their was errer in ecu with transient ignition retard causing knock.
If you have octane booster available try that and see if noise goes away this will confim it detonation or knock
we have rubbish petrol here and on stock tune car can knock or ping quite badly especially on hot day
knock will sound like metallic rattle bit like stones in a tin can or rattling a bunch of keys
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