: Oxygen sensor Smog fail



jonathan2169
04-08-13, 04:50 PM
Soooo the fun continues...

My recent 2004 CTS-V purchase failed smog due to an Oxygen sensor reading (bank 2). I don't want to assume it is the sensor itself, but that's prolly be the easiest fix! I am calling the dealer right now since they failed to test it in the first place - not sure how that'll pan out, but we'll see. Should I take it to autzone for a quick test, or should I pump the Smog inspector for more info?

Anyone else have a similar failed Smog? Car has 98+K miles, and I am really hoping to get smogged, registered and cruising! :/

Bacon V
04-08-13, 05:50 PM
You must live in CA..

Do you have a check engine light on or did the car actually fail a sniffer test? With those miles I'd be willing to bet it's actually a bad cat instead of a bad sensor.

jonathan2169
04-08-13, 06:14 PM
Yes in CA... Great for a lot of things - def not in this case. :)

Evidently the check engine light came on during the test itself. I wasn't there for it...

D3l7a3ch0
04-08-13, 07:13 PM
I had the same code, 0420 i think. It's my driver's side cat. but I'm registered in Texas

Requires a new cat to pass CA smog. It's a bolt-in deal, but it's $200 ish, I think.

if it was the other side, I'd give you mine. that side is still good.

wait, are they directional? I don't remember. (if they are not, you can have it. swap them out here, but empty it for me first lol)

it's nothing, I'm planning to get new exhaust soon-ish anyway.

Bacon V
04-08-13, 07:24 PM
The cats are directional to hug the block. A new cat installed at a shop or dealer will be considerably more than 200. You can scrap a bad cat for 50 bucks - i think a new one is 250-300 just for the part. Get stock ones if you want to pass emissions - high flows usually don't pass the sniffer

D3l7a3ch0
04-08-13, 07:33 PM
well that's disappointing.

I put some slots into the flanges when I put my motor mounts in (to allow stronger, bigger bolts), but I couldn't recall with certainty if the side mattered (obviously).

:-/

RyRidesMotoX
04-08-13, 10:46 PM
I have stock manifolds and cats... Come swap em out for the smog test if you need new cats.

D3l7a3ch0
04-08-13, 11:11 PM
Double bacon cheeseburger...

...it's for a cccoppp

Bacon V
04-08-13, 11:13 PM
goo, i just checked gmparts direct and they want 340ea for new stock cats. Id check in with RyRides for his take offs. I have some too, but im nowhere near you

joshuajohn1981
04-08-13, 11:15 PM
I might be wrong but isn't it the seller's (dealer's) responsibility?

Bacon V
04-08-13, 11:25 PM
Dont know how things work in CA where you have strict emissions, but I would assume elsewhere that when you buy a car 9 years old, you buy it as is.

D3l7a3ch0
04-08-13, 11:58 PM
if a cat is the extent of it, someone else is going to scoop up
the V, and the seller might know it.

also,

these cats go out at 80k miles like clockwork

over engineering is wasteful, under engineering is warrantied,
and the car is out of warranty........

it happens! (you didn't get a lemon, at least I don't think. just needs a cat)

*cough* for now. I'm at 100k miles and I'm replacing things too.

------------

you know how they say... always take a used car to a mechanic
before you buy? too easy: take it to the dealership and have them
do the inspection. let them know you're looking for signs of damage

(though, this is hardball, so have your own financing... decline registration...
no mats, no extras, no third party service package. walk price)

------------

did you get the V from either a carmax or a manufacturer dealership?

RyRidesMotoX
04-09-13, 03:12 AM
Like I said, I'll get you my set to bolt up for the test. I can bring em to the cruise this weekend if you want. I would just like them back afterwards in case I need them to pass smog

joshuajohn1981
04-09-13, 05:04 AM
Where in California does Jonathan live? Does he even know about the cruise?

D3l7a3ch0
04-09-13, 06:51 AM
right next to me (signal hill)

PISNUOFF
04-09-13, 10:50 AM
Go have the code read before you go replacing parts. As I see it, right now you don't know what is wrong. It could be the sensor and it could be the cat itself. There are 4 or 5 different fault codes just for rear ("sensor 2") oxygen sensors. Reading the codes will tell you exactly what needs to be done.

jonathan2169
04-09-13, 11:16 AM
Good morning guys. Thanks for the insight and willingness to help out!
@joshuajohn - So far the dealer is working with the smog station and they are replacing the O2 sensors at the dealer's cost. I will wait for the reinspection today and see if that was the issue or if a new cat is needed. If so, I hope the dealer will accept the onus again(like you said). As far as this weekend's cruise, I won't be able make it. Are you coming up here for the Grand Prix festivities? Should be fun...
@RyRides - Dude, thanks for the offer, and if it comes to that I'll hit u up. Way cool to see how you guys rally for the cause! Where are you at?
@D3l7 - I'll let you know how it goes today. If it passes, I'm hoping you'll be around this Saturday to go through the car with me and maybe see what else I can upgrade, repari, replace. I am glad to see you've already replaced motor mounts, bacause I am thinking I'll be doing that right away.
@Bacon - Yes, it is "as is", but my understanding is it is their responsibility to have a registerable(?) vehicle, which here includes smog.
Thanks again guys!!

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@PIS - I have to believe the Smog inspector is reading the correct code, otherwise he'd be taking the dealer for a real ride replacing the wrong part.

Fingers are crossed! :/

joshuajohn1981
04-09-13, 01:24 PM
Good morning guys. Thanks for the insight and willingness to help out!
@joshuajohn - So far the dealer is working with the smog station and they are replacing the O2 sensors at the dealer's cost. I will wait for the reinspection today and see if that was the issue or if a new cat is needed. If so, I hope the dealer will accept the onus again(like you said). As far as this weekend's cruise, I won't be able make it. Are you coming up here for the Grand Prix festivities? Should be fun...
@RyRides - Dude, thanks for the offer, and if it comes to that I'll hit u up. Way cool to see how you guys rally for the cause! Where are you at?
@D3l7 - I'll let you know how it goes today. If it passes, I'm hoping you'll be around this Saturday to go through the car with me and maybe see what else I can upgrade, repari, replace. I am glad to see you've already replaced motor mounts, bacause I am thinking I'll be doing that right away.
@Bacon - Yes, it is "as is", but my understanding is it is their responsibility to have a registerable(?) vehicle, which here includes smog.
Thanks again guys!!

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@PIS - I have to believe the Smog inspector is reading the correct code, otherwise he'd be taking the dealer for a real ride replacing the wrong part.

Fingers are crossed! :/

Glad the dealer is doing their due diligence. Good luck. It'll be worth the wait, you'll love this car!

D3l7a3ch0
04-09-13, 01:54 PM
revshift motormounts--the blue ones

harder than stock
softer than race

just right

Bacon V
04-09-13, 02:03 PM
revshift motormounts--the blue ones

harder than stock
softer than race

just right

When did we start talking about motor mounts?

joshuajohn1981
04-09-13, 03:20 PM
When did we start talking about motor mounts?

Haha. That's what I was thinking.

D3l7a3ch0
04-09-13, 04:29 PM
(order the motor mounts sooner than later)

OP is considering motor mounts

odla
04-09-13, 05:51 PM
I thought the cats are under a 10 year 100k mile warranty? Take it to the dealer under the warranty.

Bacon V
04-09-13, 06:49 PM
Cars 1995 and newer have to meet 8/80k per federal requirements

PISNUOFF
04-09-13, 08:06 PM
revshift motormounts--the blue ones

harder than stock
softer than race

just right

Has anyone else taken out their blue revshift mounts after they've had some use?

Bacon V
04-09-13, 10:03 PM
Has anyone else taken out their blue revshift mounts after they've had some use?

No, but i just put some in this weekend...what are you gonna tell me is wrong with them?

liqidvenom
04-10-13, 02:40 AM
Brian could break Wolverine ...nothing can survive him.

What cruise this weekend? I live out in Long Beach

D3l7a3ch0
04-10-13, 07:53 AM
I think it's down in SD

liqidvenom, any chance your V is black...

I'm wondering when I'll run into the owner of the black V i tried to start a traffic slalom with a few months back. (605s to 405s to the 22. they didn't go for it.)


No, but i just put some in this weekend...what are you gonna tell me is wrong with them?

PISNUOFF managed to liberate the cores from their repressive polyurethane shells. with the motor. I'm not worried about mine, I'm pretty sure his ...conditions are unique. revshift has updated their motormount cores since/as a result iirc

[yes i've been up all night. I think I aced my physics midterm last night, and eliminated the curve. still feeling amped over it]

jonathan2169
04-10-13, 03:34 PM
UPDATE:
The O2 sensors(bank 1) passed, BUT now the O2(bank 2) sensors are flagging... Once again the dealer is replacing them, so unfortunately smog will be delayed another day, however the more repairs the dealer antes up, the better!
@D3l7 - congrats on the midterm!

D3l7a3ch0
04-10-13, 05:08 PM
:D congrats on the smogging!

RyRidesMotoX
04-10-13, 07:17 PM
Brian could break Wolverine ...nothing can survive him.

What cruise this weekend? I live out in Long Beach

Its near Temecula, Ca. Check the Southern California thread I posted up a link there. I'm on my phone now so I don't have easy access to the link.

liqidvenom
04-11-13, 01:28 AM
My car has Jersey plates on it....most likely wasnt me.

jonathan2169
04-13-13, 03:13 AM
UPDATE: So we finally passed smog. It was the O2 sensors (both banks) and both were paid by the dealer. :)
So now we roll into some DIY fixes. I am a few steps into replacing the Steering Wheel Position Sensor (thanks to the awesome step-by-step by CancerJCC on these forums!). Motor mounts, differential bushing and trans mount inserts are en route from Revshift. And as soon as I can isolate the intermittent coolant leak that will be next on the hit list.
Anyways really stoked that the car is legal and looking forward to getting it running smooth!

PISNUOFF
04-13-13, 08:08 AM
No, but i just put some in this weekend...what are you gonna tell me is wrong with them?

The exact same thing that happened when CS started making motor mounts.

----------


Brian could break Wolverine ...nothing can survive him.

So ALL of my experiences with damaged parts should be discounted? I'll just stop relaying my experiences.

----------

...
PISNUOFF managed to liberate the cores from their repressive polyurethane shells. with the motor. I'm not worried about mine, I'm pretty sure his ...conditions are unique. revshift has updated their motormount cores since/as a result iirc
...

I seriously doubt I will be the only one. I'll bet my paycheck on it.

----------


UPDATE: So we finally passed smog. It was the O2 sensors (both banks) and both were paid by the dealer. :)
So now we roll into some DIY fixes. I am a few steps into replacing the Steering Wheel Position Sensor (thanks to the awesome step-by-step by CancerJCC on these forums!). Motor mounts, differential bushing and trans mount inserts are en route from Revshift. And as soon as I can isolate the intermittent coolant leak that will be next on the hit list.
Anyways really stoked that the car is legal and looking forward to getting it running smooth!

I'm glad it was simply sensors and you didn't just start randomly swapping cats.

D3l7a3ch0
04-13-13, 12:45 PM
so let it be written, so let it be done

D3l7a3ch0
04-25-13, 10:41 AM
b-b-b-b-bump

PISNUOFF I was sitting in physics class and it occurred to me why you are causing otherwise high-rated parts to fail

when you tighten everything up, the force is applied in a shorter period of time, which makes the impulse bigger. The ratings you're going by are meant for systems that have more "give".

...to put it simply. (hitting a brick wall vs a rubber wall concept).

so even with relatively near-stock 500ish hp (iirc you have), you're using your products in a way that was not intended/beyond what they were engineered for. the power numbers are for more conservative bushings/diff/axles etc.

I... remain confident in my motor mounts

I should have an engine-to-strut tower brace sometime in the... near future that would alleviate your motor mount issues. holding all that power at two points on the sides of the block isn't the best solution for a rotating force. it's good for stock numbers, but definitely could be better.

not sure who I will get to weld it (aluminum). I also have to calculate/find an appropriate off-the-shelf bushing to use between the motor bracket and strut tower brace. (size and material to match the stiffness of "80" and "95" for the torque at a longer lever-arm............)

you might break something else, though.

liqidvenom
04-26-13, 02:09 AM
He is driving his sports sedan in the manner it is supposed to be driven. These cars just tend to break.

D3l7a3ch0
04-26-13, 10:50 AM
so... stock? heh