O2 Simulator

Does URD no longer sell O2 simulators? Was looking for them but they don't seem to be listed on the URD website any longer. Anyone have one they are looking to sell or even a link to a DIY thread?

 

Probably because they're not legal in many areas.

Maybe just replace the cat.

 

Subbd for DIY thread. Been putting mine off for so long..
..I do have a circuit that should work, but need to scope the factory pulse.

 

Subbed as well. I eventually want open headers, but without the CEL, so would need this. Looked before and couldn't find them and meant to ask this very question at some point.

 

These work flawlessly https://vipih.com/products/o2-oxyge...UwkzKb7VqYhbucgptmbRFl1IJxaRDtHRoC4K0QAvD_BwE

 

cool… kind of like the spark plug defouler but with the correct flanged ends on it

Are you using one yourself?

 

Somewhere in the FSM it should have a waveform and documentation on what sort of signal that any of the sensors output and what the ECUs expect. I remember running into these sections when I was reading about the ABS and the yaw sensors. I wonder if it's possible to eliminate the senor hardware entirely and simulate a signal from a microcontroller or 555 circuit with the right timing...

 

Thanks for this... I just bought one. I do run a high flow cat with my v6 turbo truck and 3" exhaust, but I get po420.

 

Also weren't you on Yotatech with a chicken on your avatar? lol

 

Send Gadget at URD an email asking about it. I purchased one just over a year ago. The best part about this one is that everything is in the cab, underneath the passenger seat and carpet. Under the truck looks factory with gutted cat shells in place. I live in a safety only county, all that is required is a visual exhaust inspection, nobody is going to look underneath the carpet in the cab. It works great. I looked on the urd website and couldn’t find it either, or a part number. It’s probably back ordered like everything else electronic…This is what my invoice had it as


URD Rear O2 Simulator, 5VZ-FE 3.4L V6 × 1 $119.00

 

I basically expect a 555 timer to work and even had it tuned and ready on a breadboard with what I anticipated the waveform frequency to be...then my cat decided to start ripping the wires out and it got pushed to the backburner again lol
It's just a matter of getting the duty cycle and frequency right enough to the point where it doesn't CEL on me. I'm doing it for tuning purposes... The Split Second piggyback really sucks for anything above 5PSI since you risk leaning due to losing WOT and it reverting to closed loop maps and correction factors. In other words I need it so I can trick it into thinking its always 14.7AFR long enough to develop a stable map file, then make a device that triggers WOT status any time I'm in boost, or at least over the 4-5PSI region. A O2 sensor CEL makes it angry and fricks the whole thing.

 

Robbery

 

I had a homemade one on mine fox years till I reinstalled the cat. Worked awesome

 

You may think so, but some of us don't have a bunch of free time to dick with it. There was a thread on the 3rd gen 4Runner forum about making your own, and it didn't seem to work even 60% of the time, lots of people were having issues, ultimately decided it was easier to go with something I could return.

I ordered one of these sims less than two months ago, so I'm wondering why they aren't on the website anymore, hopefully just a website problem

 

Just a quick update for anyone who is interested. I reached out to URD about the O2 simulator and got the response below:

We are not marketing such a product currently.

Steve (Gadget) Dopler

 

Well that sucks, glad I got one when I did. I actually didn’t need it at the time. Two months ago my front converter came apart. P0420, took them down and finished the job. Everything that was supposed to be in my front converter was in my second one rattling around. Still looks like they could sell it for “off road” applications only… idk. Legally speaking.
All of this attention from the diesel “roll coal” crowd is having a downhill effect on everyone, I guess.

 

lmao almost sounds like they're in legal trouble

 

Guess it depends what constitutes valid dicking around time. You're modding your truck...its all dicking around

I'd be interested in reading that thread though...

 

Same. I wonder if whatever circuitry they were using simulated a constant signal or something else. From what I have read about the CANBUS system and different control modules is that they will accept a certain number of odd readings before they throw a code. So if it was expecting a different reading at startup (i.e. anything other than WOT), those faults might accumulate.

Do you have any leads so that I point the Googlebot in that direction?

 

3rd gen 4Runner = 1st gen Tacoma, no CANBUS yet
Some did have widebands though, just like some Tacos