02 sensor bung

Hi, I noticed when removing the pre cat 02 sensor off the mk4 downpipe to fit onto my new scirocco mk2 downpipe there was no washer?
Not sure if this is normal or would there be any harm in fitting a copper crush washer when i refit this onto my new downpipe?
IMG_20220724_114702 by Paul Miller, on Flickr

 

No washer on any of the exhausts I’ve messed about with. Copper washer would likely get all soft and be pointless anyway.

 

What's on a lambda sensor?
Is there a steel crush washer on them?

Edit, the blanks seem to have a washer, and think had one when fitted one in my old classic mini (futureproofing for injection)

 

Cheers for your help guys, no washer It is then. Its the first time I've ever removed one hence the daft question

 

There are no daft questions, well almost none

 

If it does leak without, you can always fit a washer after.

 

Ah nice one, thanks for clearing that up