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have SEL for post cat 02's? I have a SOLUTION

12K views 94 replies 28 participants last post by  bimmerguy055 
#1 · (Edited)
Hello everyone,

For those of you who have a Service Engine Light for downstream or post 02 sensors. I have made a emulator for my car, and I thought I should spred the word out, If anyone who is running after market headers, turbo, no cats, or bad 02, I have what I think a reasonably cheap solution to fix the trouble codes for good. :yikes: guaranteed to work!.:thumbup: should be used for "off-road use only" meaning NOT for vehicles on public roads!

I have made a discrete circuit that simulates the voltage your post-02 sensors. along with the heater. Pm me if your interested.

NOTE: I am NOT responsible for what the end-user does with the unit I would make. The user is fully responsible what actions he/she does with the unit.
 

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#3 ·
yes, E46tknv you are correct. But for others who don't want to make their own, know how, or want a plug N play, I could make them. Thats all. I know someone who wants one, and just got the idea to post up, in-case anyone else wants one.
 
#15 ·
For any fault codes relating to the downstream 02 sensors, it will keep the ECU happy. Assuming you have no other pending SEL fault codes, I wouldn't see why one couldn't pass emissions with it. These are solely for "off road use" if you plan on using them to pass emissions, your accountable, and I'm not responsible for what you do with the 02 emulators. I will just be responsible for the emulators to do their job and work as described.
 
#22 ·
On long drive that Plastic will metal and will cause a fire....
 
#26 ·
melt from engine heat? or resistor heat?

Now in my first ones (like pictured on my 1st post) had some concerns with heat in-regards to the resistor producing alot of heat. In-turn the plastic housing would slightly warp. Since then, the resistor would be mounted externally on the box. And now from switching over to military-grade resistors, allows mounting points, therefore the 02 sim box will be sealed, and the resistor completely separate, eliminating heat issues.

Now if your talking about engine heat, I wouldn't be too concerned. unless its next to the exhaust manifold. Keep in-mind that our cars have plastic valve covers. I tell customers to mount the 02 sims in the "drug-bin" (attached picture) for a couple of reasons, puts a longer life on the 02 sim from keeping it away from heat and water. plus room for the customer to mount (supplied self-tapping screws) the resistor.
 

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#24 ·
The drug bin is not where the battery would go. In earlier cars is was where the ABS pump and controller was mounted and it is also for right hand drive cars for the master cylinder as I recall?
 
#27 ·
Resistor. Best to mount on metal to displace heat from resistor.
 
#39 ·
It will be very similar:), remember, I have to make these by hand.

I hope this works for others!! The post cat O2 failures are downright annoying P0420 and P0430. I tried everything on my former 325xi to defeat those codes and yes I did have the original exhaust / cats on my car. I finally traded in the car as I could not pass PA state inspection without new cats (~$2000)

To the OP, I had contacted you over 6 months ago and was interested in your device, but I recall you had told me it does NOT vary the voltage which it reports back to the DME. Everything I've read indicates the DME wants to see voltage that fluctuates which is indicative of a working O2 sensor right? Intrigued how your product is preventing the CEL codes if it does not vary the voltage?
Originally I used a resistor and capacitor to show the ECU a consistent voltage (.415v) witch seams to keep the ECU happy and keep the car in open-loop right before the closed-loop mark (.45v) so logically speaking the car stays at a perfect balance between rich and lean ~ 14.7 AFR. This method I found out was a hit or miss, as the spark plug defouler method (taking the 02 sensor out of the exhaust flow) was.

A more complex circuit would need to be built so the ECU does not flag the consistent voltage. This would call for a oscillating signal generator (witch I currently use), that would oscillate the voltage signal from .11v to .81v greatly mimicking what a typical working post-cat 02 sensor should be doing, and in-turn, keeping the ECU happy.


This will not pass emissions on those inspection sites that look for codes. You will still have codes. The only real solution is the LC-1. Look here http://forum.e46fanatics.com/showthread.php?t=713645

I'm still boggled as to why everyone tries these simulators and not the LC-1...
I will have to respectfully disagree :thumbdwn:. I have made dozens of 02 sims by now, and everyone has successfully turned off their "Service Engine Soon" Light.

See http://forum.e46fanatics.com/showthread.php?t=925668 , one of my customers writing a review about my 02 sims, along with another with-in the thread who also had success
 
#37 ·
I hope this works for others!! The post cat O2 failures are downright annoying P0420 and P0430. I tried everything on my former 325xi to defeat those codes and yes I did have the original exhaust / cats on my car. I finally traded in the car as I could not pass PA state inspection without new cats (~$2000)

To the OP, I had contacted you over 6 months ago and was interested in your device, but I recall you had told me it does NOT vary the voltage which it reports back to the DME. Everything I've read indicates the DME wants to see voltage that fluctuates which is indicative of a working O2 sensor right? Intrigued how your product is preventing the CEL codes if it does not vary the voltage?
 
#38 ·
This will not pass emissions on those inspection sites that look for codes. You will still have codes. The only real solution is the LC-1. Look here http://forum.e46fanatics.com/showthread.php?t=713645

I'm still boggled as to why everyone tries these simulators and not the LC-1...
 
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