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The farther downstream in the exhaust that the 02 sensor is it will not get hot enough for the computer to go into closed loop, this is why you may end up needing a heated 02 sensor, to allow the computer to go into closed loop. When the computer is running in the open loop it is running on set parameters rather than all the sensor inputs in the closed loop mode.
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UMM the heaters in the O2 sensors are there to, for example, keep the sensor warm if the car is at a light, idling where it could cool off. Not to heat them because they are a ways down the exhaust pipe. You shouldnt need a HO2S.
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Boy do you have a thing or two to learn.
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Hows that? /forums/images/graemlins/confused.gif If the cat has to get 600 degrees before it will operate, why would you need a heater for the O2S because it was further down the exhaust? There just as I said, to keep the O2S from cooling off, they help it warm up quicker also.