If the knock at the Renault Sandero engine is bugged in cold condition and then warmer, it can be said to wear the parts of the cylinder piston group. This knock is a dangerous enough symptom, and it is not recommended to operate the car. The maximum that can be done is to avoid high engine loads, drive to a car service or a garage for further diagnosis and repair.
Among other reasons for such a knock (especially if the mileage of the car is small) is a defective wheel rotation sensor, hydro compensators, remnant of the GRM or loosening of the wheel of the wheel of the wheel.
