luvluvS4

I have a 2001 S4 and two codes tripped: One oxygen sensor internal resistance too large, second, warm up CAT bank 2 efficiency below threshold. Factory CAT is 1,490 plus labor and tax here in Microsoft land. $400 plus tax for Sensor.

I saw online some CAT's for around $450. You can't see them so I don't care if they don't match, I just don't want my engine light coming on. Can anybody recommend a good brand?

General comments? Thanks.

Slave IV

Not sure - but I hear Random makes good ones...

Wrinkledpants

bump in power as well as reduced heat affecting the oil in the turbos. It's probably 350 bucks to do it properly. You'll still pass emissions without them as they are there for the Europeans.

daves4izzle::ASP 3-

Jesus for $1400 you could get yourself some ASP downpipes and pimp yo ****...

JacobNeedsMoarMods/$

Those are precat codes im pretty sure so unless they bother you dont worry about it

Chris.Ranch

good second hand dp/cat/catback system too...installed.

luvluvS4

Achtuning quoted $2,195 on a "current promotion" to put in downpipes etc...

But then I heard that doing that could set engine codes off and then I would have to chip the car. I don't race and it is a triptronic. The only time I get on it is when I pass a drooler on the freeway.

Seattle/Bellevue prices are insane for car repair. $130 hr shop rates are common.

MNblackS4

I put Magnaflow cats in my Piggies and I have no CEL, I think they were around $100 shipped for both

luvluvS4

I don't see a Magnaflow listed for a 2001 S4-not available?

rktskicar

Also, if you have aftermarket DPs, then warm up cat codes can show up with cold weather.

Bruce