Oxygen sensor

[Marky mark]

Hi my car has failed its mot on emissions so I've took the oxygen sensor out to clean and noticed it was very loose where i have highlighted the photo the whole part can turn while the nut stays in place is this faulty i have ordered a new one just incase 

[smurf]

That sounds correct, otherwise it would be a right PITA to tighten up as the cable would be spinning around. It will be a compression fitting that seals when tightened up, in the same way an olive does on a copper pipe. 

[ALSALPHARD]

Hi I changed one on our yaris and it doesnt rotate- thats why you need a special socket with slot in to remove

[Geralt]

Agreed. It sounds broken to me. Mine is fixed solidly in place. Sounds like you've got an easy fix.

 

Also surprised your van fails emissions without the Check Engine Light coming on.

[Marky mark]

It's failed twice now on emissions the check light never came on I'm hoping it's the faulty oxygen sensor that's causing this new one ordered coming Saturday