am i right in thinking ive got 2 o2 sensors if so were are they. found one in the downpipe.
sti v3

 

Im sure you only have one.

 

You only have one o2 sensor & it is fitted to the top of the downpipe where it meets the turbo.

You may have a very thin second sensor fitted in the bottom of the DP, but this is a "cat on fire" sensor & you can just unplug & remove this if you like without any consequences.

 

thats good then because its got a decat. ive had a nearly cutting out problem under hard breaking at a set of light or a junction when driving hard, people have said idle control valve, air leak or o2 sensor. ive done all but o2 sensor so i will change that next.

 

If you have a VTA dump valve it will cause it, it will prob need a stronger spring as you will be sucking in un metered air....

Try blanking it off to test.

 

nice one stu

 

Only have to ask mate.

Got a couple of used sensors too