I recently ordered a zzp down pipe for lnf engine and it came with 2sensors mounting. One is straight in and the other curves. I look at every one else's on here and I only saw 1. Do you guys know what it's for or it's use I might just put a sensor to cover the hole up or something.

 

You have two O2 sensors, one is for each hole.

 

You will also need a bung to put a whole on the front one lol.

 

Yea thanks

 

When you have 2 bungs in your dp, you selected to have an additional bung added in for an aftermarket wideband. A "standard" aftermarket lnf dp is going to have only 1 o2 bung location for your down stream (post cat) o2 sensor. In the case of zzp's dp, they come standard with a j-bend style defouler which is intended for the downstream o2 only. Your primary upstream 02 sensor (on-board lambda sensor) is located in the o2 housing mounted directly off of the turbo, which is where it should stay. Do NOT move it to the other bung in your dp like otherwise suggested in the previous posts.

If you don't have an aftermarket wideband, you will need to plug this extra o2 port one of 3 ways.

1) Buy and install an aftermarket wideband setup utilizing the direct "straight in" forward most o2 bung on the dp
2) Use an old o2 sensor as a plug in the extra o2 bung. Just be sure to cut the pigtail off completely
3) Buy an o2 bung cap to cap off the extra bung

One way or another, that extra bung in the DP needs to be plugged in some shape or form. Otherwise you will just have a large exhaust leak.

 

Thank you I already installed it the same way u suggested I couldn't find a cap thru AutoZone or orielly might get it online I was thinking of using the cap since it threw a CEL on me after work. I'll probly end up going to a junk yard. Or going to home depot and find the right threading.

 

Zzp has the plug

O2 Bung Plug - Exhaust