i have an 07 LT....got an SS downpipe...SS has one 02 bung in the downpipe....mine has 2....now i gotta have a shop weld another 02 in...so just FYI its not bolt and go...

 

i have a 2.2 and only one o2 sensor... its plug and play for some.

 

I thought the 07 LT/LS had the same downpipe as the SS/SC?

 

same manifolds...are you sure its not the 08 model because they have 2 cats on the downpipe

 

you don't have one on the manifold and one in the downpipe?

 

there is 1 before the cat and one after....on the dowpipe itself

im takin a pic of the stock one now...ill load em up in a sec





and my car is an 07 LT cobalt

 

07's have the same manifold, different dp. some of the SAI models come with two o2 sensors, some come with two cats.

 

oh yeah duh im a ******* lol i forgot when i put my header on i had to cut the top one off and my header replaced the top o2 sensor.

 

so which ones important the one after the cat...wat the other one do?....this **** happens to me all the time sumtin not being bolt and go...

 

well the factory downpipe on the 07 has 2 o2 welds. i think the one before the cat is most accurate, right?

 

if you dont put both, you will trip a cel. i would suggest getting a new bung welded in. especially if someone will do it relatively cheap

 

yea im workin on that....i just had the one hooked up right now without the other...ill have the other one welded in the near future...

 

The one after the cat is for the o2 sensor that moniters the cat. Pick up an o2 bung plug at AutoZone and plug the pre-cat hole. Then use the exhaust manifold bung for the o2 sensor that controls your A/F ratio.

 

he's actually needing to have the upper bung installed in a ss/sc dp to match the setup he has on his 07 2.2l.

 

Oh OK, I was going by my 06 LS.

 

am I the only one confused?

Unless you have 3 02 sensors I don't get it...

one bung before, one after...whats wrong with that?

 

i think hes got one on the header, and 2 on the DP

 

I'm pretty sure on the 05-06 cobalts there is one bung in the exhaust manifold and one in the downpipe. 07+ there's 2 bungs in the dp. Not a big deal. Might cost you what... $25 to weld an O2 bung in?

 

but the real question is.....is that necessary in any possible aspect lol

and i thought car engineers were intelligent..

3 02 sensors? who gives a **** honestly

 

seems like everything went to hell with cobalts in 07....no tuning...moved 02 sensors...cant put headunits in em.....*******

 

there isn't 3 O2 sensors. They just moved the sensor from the manifold to the dp.

actually there's more available for the 07+ tuning wise than for the 05-06. Moving the O2 sensors was probably because of sai. And I'm pretty sure you can put headunits in the 07+s, you just have to get a wiring harness that allows for the lan system.

 

agreed. the 07 2.2 is easier to mod

i have the least amount of support of any cobalt: '06 2.2 auto /w SAI...not a fun combo