I recently had to install the pre-cats and all 4 O2 sensors on my 3.5 to pass my emissions test. However, I can't figure out how the front 3 O2 sensors are routed. The cables have zip-tie clips that snap into holes somewhere on brackets (I am guessing) either on the engine or some other parts. I must be missing these brackets because I can't figure out where to route the O2 wires. For now, I have them tied up away from hot or moving parts, but I'd like to get them routed correctly. I can't find clear pics in the FSM, so I am hoping someone has engine pics that happen to clearly show the front 3 O2 sensor cables being routed. So, if you have pics like this, could you please post them?

I have the harness correctly routed under the engine cover, and the rear o2 sensor is correctly routed, I just need pics of the 3 in the front of the car.

Here's what mine looks like:

 

the 3 right ones go to the right

you didnt pay attention when you removed them

 

I put this drivetrain into my A32, so I didn't pay much attention at the time I was parting out the donor car.

 

this is an example of when providing more information will help us answer the problem
it shouldnt matter...just run them wherever you want

 

I just want to know where they run on a stock 5.5 Gen. Yes I have them run a certain way but I'd just like to see if anyone has pics of the stock setup so I can do it exactly as Nissan would.

 

you will see holes for those plastic tabs to go....as a said, the right three go to the right

 

whats wrong with how you have it now. They were a ***** to take out with the default route.

 

There is also one (primary) near the PCV valve, which I don't have a picture of.


This may or may not help:
http://forums.maxima.org/showthread.php?t=350787

 

Thanks for the links, very helpful info. I like your headers, what kind are they?
I noticed an obvious decrease in power when removing my VQ30DE manifolds/warpspeed Y pipe (duh I know) and switching over to the stock VQ35DE stuff. However, I like how quiet the car is now (noisy Y pipe). But I am definitely considering going the full header/y-pipe route now that I experienced the difference for myself. Are people passing emissions with the sims?

 

I don't think you even need sims actually. Leave the main cat in place, and you should be good if they use a tailsniffer. Just add a bung in the new headers. Those are Cattman gen I headers.

This might help re: passing e-tests.
http://forums.maxima.org/showthread.php?t=562608

 

I have Cattman gen II headers on my VQ35. I sim one of the downstream sensors and the other one is wired to the stock sensor in the aftermarket A32 b-pipe. No codes and I pass emissions with a tailpipe sniffer.

 

My emmissions place popped me on the heater codes for the missing downstreams. That's the only reason I swapped in the stock stuff. They wouldn't let me dyno/sniff the car, they were insisting on OBD-II compliance (even they I dyno/sniffed last time around)

In the future I'll either just run sims and 2 O2's or have all 4 O2's installed (get an extra set of bungs welded in).

 

Myself and 1 other member are using our secondaries w/o any cats / sims /extensions, and do not throw codes for them. Which means that even w/o cats they do not get tripped, nor does their position matter in the exhaust stream matter, meaning you could add a couple of bungs anywhere that is convenient w/o having to extend them to reside behind the main cat.

 

Thanks, that's what I was hoping for.