The filter has been changed when the car reached 176500Km.

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The filter has been changed when the car reached 176500Km.

The filter has been changed when the car reached 176500Km.
The filter has been changed when the car reached 176500Km.

The filter has been changed when the car reached 176500Km.
反了吧,先到达176500km,再换filter吧(不该用完成时,要用也是先发生的动作用完成时啊)
The filter was changed after the car has reached 176500km.
要表示两个动作先后,when不合适用after

可以改为The filter was changed when ...

正确!