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I'll have a try tmr! Many thx
Thanks for your comment. The yellow icon has never shown. I am still not sure if my car's noice is pinging or knocking... Btw, what do you mean by...
I've tried what you suggest but everything is fine...
Thanks a lot for your reply! I've tryed using premium fuel for a few times but no difference come out. I'll take a look athe bottom of the filter...
My 2007 Prius has the mileage of 171,000km and since around 3 years before I've sensed the knocking noise from engine, especially on acceleration...