Multiple misfires 1,2and 3

[mikefocke]

Originally Posted by Gelbster

Unless the other O2 sensors have been replaced ,it is prudent to replace all at the same time.

I first got a Lazy Sensor code on the front right sensor and replaced it. Maybe a year and 6k later and just for symmetry, I replaced the front left. 30k later and 5 years the original rear sensors are still there with no codes or issue.

So why should they all be replaced at once? Is this replacing 3 sensors that aren't throwing codes the smartest $375 you should spend maintaining a Boxster?