Trying to build an o2 sensor simulator but car forums are a bad place to ask . . . - Page 4 - diyAudio
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Old 13th July 2013, 10:22 PM   #31
DUG is offline DUG  Canada
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Location: mississauga ontario canada
I had to design an O2 simulator for calibrating a O2 sensor tester we built once.

Isolate your output to prevent ground loops.

The O2 in your car is isolated and goes to two specific wires to the ECU.

I am not sure why you want to bypass the fuel mixture control loop.

This could result in your engine thinking it was delivering the correct amount of fuel and it is not.

It is not all about emissions. "You could burn up your engine" is not just a story to frighten DIYers.

The DIYers that create their own control over the O2 sensor signal still use an O2 sensor to get a reading of what is happening to the mix.

The usual method for narrowband sensor system is to use a wideband sensor and shift the threshold point to the mix that they need.

Those that want power adjust the threshold for more fuel/air when required.(usually turbo systems)

Those that use them to allow the engine to run on a leaner mix (HHO types) shift the mix point the other way. (researched this quite a bit)

They both know that you still have to monitor what the mix actually is.

Hope you learned something.

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Old 13th July 2013, 11:22 PM   #32
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Hi Jimmy. I had a quick look through a list of fault codes for your VW. I found over 30 codes related to o2 sensor range/performance, then stopped counting. Also I'm fairly sure the ECM compares the reading from the front and rear sensors, they are related as they're measuring the same gas. I don't find it "strange" at all that you got rid of one code and picked up another. There's 28 more codes waiting for you.... But best of luck ;-)
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Old 20th July 2013, 01:16 PM   #33
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I'm having problems fools the heater circuit. Anyone have old O2 sensors (perhaps broken) for v6 Passat or Audi they can sell me?
The resistance seems to go up as the O2 sensor gets hotter. I don't know what resistance, if any, will fool the computer.
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Old 22nd December 2013, 07:07 AM   #34
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can anyone help me.

can i build o2 sensor simulator without led (1.7v@20mA)
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Old 22nd December 2013, 05:42 PM   #35
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Can i build o2 sensor simulator without leds (1.7v@20mA)

If I can, then how:
1. what components needs instead leds;
2. have any schematic?
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