Can someone tell me where the problem.

about 4 months about i had to replace my 3.5 in my 2002! I got an engine from aN 04 put in with some cattman headers and Y pipe. I'm throwing codes for an o2 sensor bank one and i can't seem to get it to go away. Plus the guy where I had my headers tapped up at told me that the sensors might be in the wrong spots for them to read correctly. Meaning the port holes are placed on the headers wrong. Has anyone else had this problem? How do you get rid of codes if you have aftermarket headers. And should it make a difference with the computers from the 5th to the 6th gen! HELP!!!!

 

If you bought Cattman headers why did you have to tap anything for the sensors? Your going to need an O2 sim.

 

well i didn't do anything to the ports for the o2's I just had the leaks fix. I should have been more clear.

 

Yeah o2 Sim...Im throwing codes also, no big deal really, light does get annoying though, I got the primarys in the headers but the secondaries are completely off so I need a o2 Sim to get rid of those codes...

 

thanks for the help. I'm also throwing a cold or a misfire but I think we are going back stock for a while just to start all over.

 

misfire could easily be a coilpack.

 

Slow down there big guy.


So why were there leaks on the O2 bungs?
Did he tap new holes and plug the existing?
What codes do you have?

What procedure or write-up did you use for the swap?

 

i agree...that's alot of work and more money in justbuying oem headers again for something that can be fixed

 

Agreed....

 

just recently installed my headers with an o2 sim and havent had no cel or anything else

 

Could be a bad O2 sensor!

 

code that should vbe coming up is P0420 or P0430 which is the Cat if its something else then its just a sensor and if you dont have an O2 Simulator then you need to get one to get rid of that cel

 

No NO...there are no leaks in the bungs themselves, what i was saying is that I took the car in to gets leaks in the exhaust fixed. what they are telling is that the port for the o2's aren't right....meaning either they aren't set to where the o2's can get a good reading plus the port itself is in the wrong place.

p0133 is the code i was getting...and as far as the swap goes i got an engine out of a 6th gen and put it in my 5.5 when the original 3.5 blew a head. had a shop but the engine in for me with no problem. So i already had a 2002 3.5L and when it died i just got another 3.5L from a 2004 maxima

 

Are we talking about the primary or secondary ports?

I think the primary ports are fine in the Cattmans. No one has ever had problems before.





If they mean they are wrong for the secondary, then they're right because Cattmans don't have secondary ports.

 

Primary....but I think I might have found the problem

Bought some Cattman headers from this guy on here and he said that the headers were off a fourth gen but they would fix the 5th gen. This are the headers that are mounted the car as of now...bank 1...photo hacked from mtrai760



Now the primary o2 sensor for bank 1 is plugged into this port causing the light to come on. We could take the sensor out of that port but there is no other hole for the sensor to go into.......and suggestions.

F.Y.I this isn't my car it belongs to my brother I have a 99SE

 

I also have the 4th gen headers on my 5.5 gen.

Not sure if I'm understanding correctly, but ... You need to plug that top port because it's for the EGR. I used a bolt, cant remember the size and welded it in there. The 5.5 gen has internal EGR, whereas the 4th gen has external, that's the reason for that port. Easy modification.

The actual O2 sensor port is on the bottom right, seen in this modified pic.

 

man thank you so much this will solve my problem hopefully...but did you extend the length of the o2 in bank 1 if so how

 

Some reroute them and they will reach, me I just took it to my mechanic so he could extend them.....

 

So rerouting them should make both primaries fit into the correct port? I ask because I wouldn't want to cut my O2 sensor wires and have them soldered together. Also, as far as O2 sims go where would we get them from

and...

has anyone had any luck with these:

 

I would just separate the wires from the main harness as much as needed so they reach. I would rather not extend O2 sensors wires. people have had issues with that in the past since O2 sensor wire isn't the same as most other wires (signal wire is very sensitive).

A little creativity in the way you route them and of course cutting (carefully) the harness tape will give you a few extra inches too.

 

Is that something that can be [easily] done with headers/engine still connected or would the headers need to be removed to make for a more time efficient job. Had a guy quote $500 to remove headers and the put the O2 sensors in the correct place.

 

Should be very easy.

The harness for the rear sensor is near the VIAS/BOP area (if so equipped) and the front is right in front, near the front valve cover.