nord1899

Codes are:
17584 Bank1: O2 (Lambda) Correction Behind Catalyst: Control Limit Reached P1176-35-00
17585 Bank2: O2 (Lambda) Correction Behind Catalyst: Control Limit Reached P1177-35-00

Background is that I got 3 new O2 sensors put in at the beginning of July (front driver only one still original). Codes went away.
Did an open track day on July 4th. Temps were very warm (probably 100F ambient), oil got over 275F (quickly stopped driving hard and did cooldowns at that point, need an oil cooler) and coolant got past 1 tick right of center.
On July 5th, got a CEL with those codes. No other codes were found in the ECU.
Clear the codes and they come back after roughly 50 miles of driving.

Car mods are: suspension. Thats it. Was using regular 91 craptane pump gas. No chip, no piggies, nothing.

So what would cause this code after roughly 85 miles on the track? My two hunches are either high exhaust gas temps nuking the O2 sensors. Or the cats are going bad. Problem is, those two problems have their own codes they should throw (EGT sensors or Cat efficiency codes).

Any ideas? Seriously need some help here.

wagongotya

my guess is that we cooked the o2 sensors initially, now they are intermittently fubar'd

PSmalls::AnalRetentiveNumbNut

Try swapping rear 02s maybe? Those codes sometimes pop up when rear sensors are reversed.

My2ndS4

yup.

My2ndS4

it in the one on the left and vice versa.

nord1899

1 day at the track and they then throw a CEL? And even though I clear the codes, it keeps coming back. Almost every time within 50 miles.

nord1899

to be able to nuke an O2 sensor?

I agree the idea sounds plausible, just still has its own issues.

My2ndS4

The O2's are fine. The two O2 sensors after the cats are just each in the wrong holes. When he says swap, he means put the right one in the left hole, and the left one in the right hole.

nord1899

But I'll see about trying it.

My2ndS4

occur. But that is what those codes usually mean.