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i always wondered what the 3 o2 sensors do to the car. 1on the intake and 2 on the exhaust. what if i unplug them? and what is this obd2 emisions crap some guy was talking about? i hear i can get o2 simulators. what would be their purpose?

 
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they tell your cars computer how much air your car is getting, so it knows how much gas to mix.... i dont know if this makes sense

 
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Makes sense to me but, like gorbachev said, what do o2 simulators do?

 
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They fake your cars computer into thinking its getting the signals its supposed to be getting. If these are removed you will be running into problems, not because your car is getting poor performance, but because the computer is telling the car it is because it isn't recieving a signal. They don't have to be removed either, they are set to within specifications, which are very broad, to monitor gas levels of all the wonderful pollutants coming from your car, and if for some reason your car exceeds these, you will get a check engine light.

 
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i searched all over ebay and what not and i couldnt find any o2 simulators. where can i get them from and how many do i need?

 
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An O2 sensor detects the levels of exhaust leaving your car. Normally, they are useful for the onboard ECU to detect fuel ratios and timing. Out vehicles use two sensors. One before the cat and one after. The ECU then compares the two to ensure that the cat is indeed functioning.

Why you may need an O2 simulator? Basically, when you remove the cat or replace it with a high flow model, the difference may not be enough (as in a removed cat). This causes the ECU to believe the cat has failed. This give you a check engine light and the ECU lowers the performance of the motor to compensate. An O2 sensor tricks the ECU into believing everything is fine, thereby allowing you extra flow and maintaining performance.

Check out this Link

 
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if another word, if u dont want ur light on, u need it. light on=default mix=slow=no good=me no speak english

 
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rick answered the question....

but there's only TWO O2 Sensor.

the intake does NOT have an O2 sensor... its a mass air flow sensor... not an o2 sensor...

and Dr5D answers the question on what the MAS does...

there are a lot more sensors on the car. heh. but yeah those are the two genearl ones people talk about all the time.

 
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im still in high school and have autotech, our teacher is a genius and knows alot of things about cars!! i mean alot!! well we were learning about exhaust and the catalytic converter isnt that restricitive!! its like 15% not even that much cause of newer and improved designs. well the most restrictive part is the down pipe or "mid pipe". and he says that this is the most improvement. and if u want to find out how restricitve your exhaust it then use a flow bench. for a really good exhaust and gaining the most horsepower it should be 2% restrictive, if its like 5% it doesnt really matter cause its like a 1hp difference, but if its like 20% thats almost 10 hp. so find out if u even need the high flow cat! and why, it doesnt really help and its ILLEGAL!!! and pollutes!

 
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Yes we do only have 2 o2 sensors which are on the exhaust. I don't think our cars have a mass air flow sensor. The sensor on the intake is the IAT (internal air temperature) I hope this helps... Later....