FYI this o2 simulator circuit fools our computer successfully, just tried it out on my car. For those who don't mind some soldering it can be built for quite a bit cheaper than the o2simulator.com type o2 sims.
I hope this isn't a bad question, but if you created a circuit to "fool" the ECU into thinking it is using an O2 sensor when its not, wouldn't that make the car run too lean/rich or just less efficient?
The only purpose of the post-cat o2 sensor is to detect whether the catalytic converter is functioning properly. This simulates the signal that the o2 sensor would send when the cat is functioning properly. (well simulates it close enough to fool the DME)
And yes, this is for simulation the post-cat o2 sensor only. Simulating a pre-cat o2 sensor would do all kinds of bad.
Sorry to revive an old thread, but 2 questions for the OP.
Did you use 1/4w resistors? And did you have to simulate the heater circuit or did you leave the o2 sensors plugged in.
I have a month to get my emissions done and this is going to be the cheapest route.
I do not recall what the power rating on the resistors was that I used, but the signal lines don't carry much power so 1/4 watt should be fine I would imagine. And yes I just used the old sensor's heater instead of simulating a heater circuit
I just used the MKIV link this weekend and soldered up the circuit. Installed it yesterday. Fingers crossed...hoping the Check Engine light will finally stay off.
I remember a post about the signal output changing...will this work on an 2003 model?
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