The Lambda sensor ?
Try cleaning it with a wire brush only.
Yes its important if you want low emissions & good fuel economy.
The cost for UK version is £100, for early version is 93-94 WRX then kiss good bye to £240, but you can use a UK version with longer lead.

 

after having a couple of Check Engine incidents , It seems I have a Code 32, which means Oxygen Sensor not working , had a gander at it, there is no obvious reason why , it's a bit oily round the wire end (Ooer missus ) but still attached .
What exactly does it do , how vital is it to the health of the engine/Turbo, and will it last a couple of thou to the next service , Oh and as I'm out of warranty what will the bug*er cost !!!!!!!!!!!!!

 

Thanks Mark ,yea I forgot to put in this post that the car is uk spec my00 . Could be the Lambda probe for all I know , but is described as oxygen sensor and located right against the turbo at the top of the down pipe

 

Thats the lambda sensor. Usually only older cars that give trouble,ie like mine 94.

 

Thanks again

I'd better get it sorted

Cheers