I purchased the ZZP stainless downpipe with cat for my 07 Cobalt 2.2l. I noticed there are two 02 bungs (front and rear 02 sensors) on the stock downpipe and only one on the downpipe I purchased from ZZP. Do the two 02 sensers connect somehow or do I not use one of them at all? If so, which do I use? Will it throw a code? Please provide as much info as possible on the subject. Thank you!

 

One is for a wideband. Just plug the hole with a small bolt of some sort.

 

I have a ZZP header/dp... Threw a code as soon as I unplugged the o2 and connected my wideband.

Can't remember what I did with the other o2 though.. lol ****..

OP.. Do you have a c5z06? ANd a cobalt as a DD?

 

read it again...

OP- Most aftermarket header's / DP's come with an O2 bung on each of them. On your particular year they put both sensors on the DP. On 05/06 there is one on the manifold and one on the DP.

So you have 2 choices. Get an aftermarket header , or have another O2 bung welded in your new DP

 

I did but sold for a new toy. I haven't decided but I'm looking into possibly a c6 z06 or MKIV Supra. My mind always changes though. Haha!

Makes sense. Thank you!

 

i used my front o2 and my wide band. the other rear sensor that reads after the cat... i cut it off. nothing ever ran bad. that was on my ss/sc

 

You're getting a c6z? That's teh ******* sex.

 

i dont use a rear o2