freak

i searched the archive and found that its either the cats OR o2 sensors. So which one do I replace?
TIA

BTW, this is the code:1 DTCs Found:
16815 - Warm Up Catalyst Efficiency Below Threshold (Bank 2)
35-10 - - - Intermittent

DAP@EPL

The cats are integrated into the downpipes so you'd have to replace the whole downpipe. IIRC, retail price on one OEM downpipe is more than a pair of aftermarket DPs ($1500+).

Bank 2 is the driver side so replace the driver side rear O2 sensor and see if it helps.

-Dave Pramanik

djillusion

usually has to do with the rear O2 sensors and possibly the cats.

what are your mods?

DAP@EPL

try clearing it first and seeing if it returns before replacing anything.

-Dave Pramanik

Fixn2xlr8

incase you want to do DPs down the road.

freak

it is autospeed downpipe. i got it installed with ecstuning and it never throw any codes for 2 years, and its doing it now. I have cleared it 2x and it comes back for the third time. The CEL usually comes back after 500miles or so.

On vast performance website, it shows I can only buy the Zoldman in pair, can I just get ONE side of the sensor?

thanks guys!

Nigel (no more S4)

My AWE ones are, I've replaced them both.

krazylegz

But my car has almost 87k miles now.

DxC

and daily drive your car? do a lot of people on this board run test pipes in daily drivers?? i feel it is kind if irresponsible to the environment dont you think?

the minor hp gains are killing the environment.

sounds like im a tree hugger now but the catalytic converter was a great invention ... and it has a purpose. just simply bypassing it for 5-10 hp and increased spool up in a daily driver isnt worth it

freak

yeah i agree, thats why i dont run test pipes. I have cats on, thanks though.