P1176 and p1177 (i have defoulers)

[JDM EJ1 95]

i have defoulers..

but im still throwing these codes

its for bank 1 and 2 after catalyst.. control limit reached.

any help?


AWE stage 3.. with an OTS stg 3 file..

[The_Jerbel]

Try some taller defoulers or else have the software company code out the rear O2's for you.

[JDM EJ1 95]

i have 2 of the big ones on there now.. theyre like 5 inches long haha.


id have to send my ecu to GIAC? or would a dealer be able to handle it?

[The_Jerbel]

A dealer should be able to take care of it for you.

[VR4-S4]

A dealer should be able to take care of it for you.

I was told that GIAC dealers cannot...?

[The_Jerbel]

hmmm, that's weird. Why wouldn't they be able to if they sell the stuff...

[Allaidback]

having the same issue and called GIAC...said they could not code out the o2 for legal reasons (federal law). So, whats the solution if the defoulers don't work? Could anything else be causing these codes?

[sikxer]

FYI.. I have the same exact codes right now. After doing some research, I found a few other people with the same issue and it turned out that the culpret was actually the coolant temp sensor. I picked up a new sensor but haven't had a chance to install it yet.
Figure it's worth a try.

[JDM EJ1 95]

wtf? that makes 0 sense..

[Allaidback]

post links to related coolant sensor talk. I guess the coolant sensor could play a roll in this since it can cause the ecu to trim its fuel incorrectly.

[sikxer]

Here's a couple:
http://forums.audiworld.com/s4/msgs/2578888.phtml
http://forums.audiworld.com/s4/msgs/2376232.phtml

[b5s4tt]

ive had a coolant temp sensor do that in other vehicles. it would change the mix. im not saying its your problem but it is something to look at. what type of downpipes or piggies do you have ?

[JDM EJ1 95]

GHL downpipes.. on my old tune it never had issues (old socketed AWE stg3 file)

but now i have the updated AWE file and a newer ecu and its been doin it ever since

[Allaidback]

If it was the coolant temp sensor wouldn't it be causing other problems too?

[JDM EJ1 95]

well in light of this situation.

i ordered a coolant temp sensor.

i put a OBD2 scanner on my car the other day after it had been sitting for 4-5 hours... which im assuming by that time it was prtty much fully cooled off.

well my coolant temp was reading 170 degrees before starting it up..

car is running rich..

thats the only thing i can imagine causing this.


hopefully it fixes my p1176 and 1177 codes like people say it might

[team_soy]

Any updates?..I don't have this problem personally but would be some useful info to have.

[Allaidback]

I just installed the new coolant temp sensor after having the same issue and same codes being thrown. Codes have come up twice since replacement? AWE's website says that the cause for this code is a faulty coolant temp sensor or an intake air leak. But I haven't experienced any boost issues and my vacuum is at 20? Anything else I could check?

[Allaidback]

Well, think I fixed the issue...code hasn't come back yet after replacing the brake booster hose. It was leaking some air around the fitting...so how does this affect the engine? I thought it was for the brakes?

[JDM EJ1 95]

It affects the tune..


i havent made any headway on the issue.

im going to leak test the intake system.

[damnthemansam]

silicone the hose where it goes into the fake fire wall, pu a coolant temp sensor in it and put some good quality 93 oct in it (sunoco or something of the sort) and clear the codes

i have had those codes for days with defoulers and a while after i switched from cali 91 oct to mass 93 octance they went away

[Allaidback]

damn these cars...you fix one code, then another pops up. So, fixed the "catalyst below threshold" code with defoulers...then "control limit reached" code came...now that I made that disappear I got a "O2 sensor malfunction circuit" and multiple misfires? WTF

[rms-s4]

so0 figuring out what this code actually means before we throw parts at it is a good idea. its saying the rear o2 post cat is reaching its limit. meaning its over compensating for a) an exhaust leak that is before the rear o2 sensor , or b) its overscompensating for the front o2 that is in the process of shitting the bed or it has shit the bed.

this happens a lot if the flex pipe in the downpipe is broken or if you have a dead front sensor

start there...

[rms-s4]

if your stage 3 and have a cat it shouldnt be an issue if you dont have a cat defoulers really arent gonna help too much either. im sure they work but its not a garuntee

[Allaidback]

so0 figuring out what this code actually means before we throw parts at it is a good idea. its saying the rear o2 post cat is reaching its limit. meaning its over compensating for a) an exhaust leak that is before the rear o2 sensor , or b) its overscompensating for the front o2 that is in the process of shitting the bed or it has shit the bed.

this happens a lot if the flex pipe in the downpipe is broken or if you have a dead front sensor

start there...

But wouldn't it throw a code for the o2 sensor as well?

[rms-s4]

im sorry, if the front sensor was dead it would throw a code for it, but since it prob isnt, its throwing a code for a rear o2 because its doing a lot of compensation for the lazy front one. but before you waste your money on replacing that o2, check for exhaust leaks before the back o2s, a hole the size of a a pencil tip is enough air to cause a lean condition and cause a rear 02 code.
i just did a a6 yesterday that had a pin hole leak in the flex pipe where a weld was rotting, the o2 checked out ok when i tested it and i re welded a new flew piece in, ran the o2 monitors and it fixed it.

[2003svtjrc]

digging up an old thread

I am having the same issues with these codes. So far I have installed new 02s (all 4), siliconed the brake booster hoses, Rebuilt the pcv spider hose with a new valve, new plugs, new downpipes, stage 2 tune with cat delete, new coolant temp sensor, cleaned maf, check for intake leaks via carb spray. I just did the temp sensor tonight but the way my luck has been this will not fix it, just wondering if anyone has gotten these codes to go away?