this would be the 1st thing i'd check, if its buggered you'll be using alot of fuel, just take it to any subaru specialist workshop & get them to check it

[QUOTE=Strubaru;450551]this would be the 1st thing i'd check, if its buggered you'll be using alot of fuel, just take it to any subaru specialist workshop & get them to check it[/QUOTE]
will do, many thanks for your help. Would a buggered o2 sensor cause more black residue coming from the exhaust? i initially thought i had a leak in the plumback hose from my hks ssqv.

if the o2 sensor was stuffed, wouldnt a CEL light come on?

[QUOTE=smerm07;450553]will do, many thanks for your help. Would a buggered o2 sensor cause more black residue coming from the exhaust? i initially thought i had a leak in the plumback hose from my hks ssqv.[/QUOTE]

yes

mine didn't throw a cel on my99 model, the only reason i knew was fuel consumption (50km less per tank) & my afr gauge didn't move as it usually did

[QUOTE=Strubaru;450622]yes

mine didn't throw a cel on my99 model, the only reason i knew was fuel consumption (50km less per tank) & my afr gauge didn't move as it usually did[/QUOTE]
cheers,

so you had to replace your sensor? fairly sure my o2 sensor is located between the dump pipe and the mid section part.

My rear 02 sensor is causing a CEL. Doesn't seem to make a difference to performance/fuel consumption though. Car has a Verso tune.

[QUOTE=RichX;450628]My rear 02 sensor is causing a CEL. Doesn't seem to make a difference to performance/fuel consumption though. Car has a Verso tune.[/QUOTE]
im running a verso tune as well, no CEL lights though.

[QUOTE=smerm07;450629]im running a verso tune as well, no CEL lights though.[/QUOTE]


I've gone through 2 rear 02 sensors. Dunno why but they keep popping. Not even sure if i have a front one in the up-pipe? I know i have the resistor mod on my car when the full TBE was install and catless up-pipe.

Perhaps there is still one on the headers.

checked the o2 sensor on sat, seems fine. Any other suggestions?