I bought a bunch of O2 simulators as an easier/simpler solution to relocating secondary O2 sensors when installing Cattman Performance headers (in 99-00 CA/NLEV Maximas and all 01-03 Maximas) and y-pipes (02/03 only). They can be used in a variety of situations so you don't have to extend wiring harnesses or weld in O2 ports. Also useful when you need to be sure the ECU's getting the right signal, all the time, to avoid those pesky CELs.

These are high quality, solid-state units that can be used on almost any OBDII car. Only one sensor needed to provide a signal for both O2 secondary sensors. Here's a pic (of five):



I don't know if these have been sold recently or at what price, but please respond to this thread if you're interested in a group deal. I can probably do them for around $27-28/each or two for $52, shipped. A wiring diagram is included.

Brian C Catts
Cattman Performance

Brian C Catts
Cattman Performance

 

would this work for rear O2 sensor?

 

Yes, it substitutes for the one or two secondary O2 sensors that Maximas have, depending on the model year and emissions system. Its probably more than you're interested in, but I'll do a quick "Secondary O2 Sensors 101" in case its useful for anybody:

The front and rear primary O2 sensors are located near the engine, screwed into the base of each 3-1 collector on the stock manifold. They provide a variety of information to the ECU and the car won't really run without them. There are no simulators for the primary O2 sensors, there wouldn't be any point. The two primary O2 sensors are in the same basic location on every Maxima, but the secondary O2 sensors are another story.

There is one secondary O2 sensor in all 95-98 Maximas and in 99/00 Federal emissions Maximas; its located in (95/96) or just behind (97-00) the main cat. There are two secondary O2 sensors in 99/00 CA/NLEV emissions Maximas and in all 01-03 Maximas; one's located in the downtube of the front pre-cat unit and the other's in the rear downpipe of the y-pipe (there's nothing behind the primary cat).

The only purpose of a secondary O2 sensor is to determine if there's a functioning catalytic converter someplace between it and the primary O2 sensor. That's why its possible to make a chip that will constantly send out the signal that the ECU is looking for. In the Maximas that have one, its there to see if the main cat is in place and working; in Maximas with two, they check to see if the two pre-cats are operating properly.

But whether you have one or two secondaries, you only need one simulator.

Brian C Catts
Cattman Performance

 

Im interested in two...pm sent

 

count me in for one... I need to get one of those air filter guys too... I'll email tomorrow and order..

 

subscribing......

 

Brian I'm down for 1 but what is your paypal address?

 

i need 1 too need info on how to pay

 

Sorry it took a few days to respond. My PayPal address is bcatts@earthlink.net. Please make sure you include LEGIBLE (sorry, got one I absolutely could not read the other day) information about what you're ordering, the shipping address, the amount enclosed for the product and your daytime contact information.

Since I'm sending these out of the office rather than the warehouse, I'll note that I'm going to be at SEMA this week, but will be back in my office on Friday and will ship out any O2 sensor simulator orders then.

Brian C Catts
Cattman Performance

 

My PayPal address is bcatts@earthlink.net. Please make sure you include LEGIBLE (sorry, got one I absolutely could not read the other day) information about what you're ordering, the shipping address, the amount enclosed for the product and your daytime contact information.

As I note above, I will be back in my office on Friday and will ship out any O2 sensor simulator orders then.

Brian C Catts
Cattman Performance

 

So with one of these sensors, i can use a fed spec ypipe for my 99 calispec max?

 

I want to put headers on my 99 cali spec. Do I only need one of these stimulators?

 

interested...these are the same from 02simulators.com..or different?

i need for 2002 se maxima for cattman headers gen 1...

please let me know how many i need

thanks

 

02 maxima california emissions
How many simulators will I need if I get either headers or a y-pipe?

 

This would be fine for bypassing my rear (useless) O2 correct?

 

No, the Federal and CA/NLEV y-pipes (stock or performance) are not physically interchangeable, it has nothing to do with O2 sensors.

Brian C Catts
Cattman Performance

 

They are, and you only need one.

BCC

 

Just one, in either case.

BCC

 

Yes, as long as the heater circuit is complete.

BCC

 

payment sent.

 

im sorry, I said I wanted 2 but will these work for my 96 max?

BTW...i dont have cattman headers....i have a y pipe and a test pipe but im throwing my cel for my 02 sensors in my cat anf y...so will these fix my problem

 

subscribed................

 

If you just need this for one car, you just need one O2 sensor simulator. It will substitute for either or both of the secondary O2 sensors.

If the CEL is from the either or both of the secondary sensors it will work, if the CEL is from one of the primary O2 sensors it will not.

Brian C Catts
Cattman Performance

 

out of curiousity what is the difference between your o2 sim and the one from o2 sim.com? other than price of course.

 

None, they are the same.

BCC

 

I want one of these what is your address so I can send a check or money order?

 

hey brian heres a question for you, could the o2 sim be put in if the old o2 is non existent? meaning not there at all?

 

Do I still need one if I bought a y-pipe with a 2003 maxima?

 

Disregard post. Spoke with Brian. Thanks for the help.

 

I should be ordering a set of cattman gen 2 headers for my 2k1 cali spec sometime over the winter, so I need two 02 sim, right ?

 

Obviously we're in business to sell as many parts as possible, but you will only need one, rather than two. Just one of these simulators can cover either one or two secondary O2 sensors.

Brian C Catts
Cattman Performance

 

Payment Sent (ID #3W199558J6984125S)

 

i need a dual out to handle both of my rear o2 sensors on an 02. got anything left?

 

say if the fans keep on running would that also lead to a cel code for a c02 sensor??

 

We just have the one type, which handles single or dual secondary O2 sensors. There are plenty in stock and I expect that we'll be carrying this part on an ongoing basis.

Brian C Catts
Cattman Performance

 

Fans? I wouldn't imagine there is a connection between the secondary O2 codes and fans (I assume radiator cooling fans) running.

BCC

 

Thats what i though I'm thinking with my car my temp. switch is going bad because the fans keep on running. when i saw this "Yes, as long as the heater circuit is complete."

 

me to

 

Now I see. Different heaters - the secondary O2 sensors each have a heater circuit that the ECU looks for and throws a code if it can't find it. That's why you still have to have the O2 sensor wired in even when using a simulator - the simulator tells the ECU what it wants to hear about the exhaust, but it does not tell the ECU that the heater circuit's still there if the O2 sensor is completely removed.

Hope that makes sense...

Brian C Catts
Cattman Performance

 

Brian, thank you for help again talked to you on the phone before.