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Old 03-16-2008, 12:14 AM   #1
Khellendrose
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Default O2 Sensor Question

What is the difference between heated and unheated? And what would be the best ones to get for my car being an 01 SC2? From what i has seen online heated has the ability to heat the sensor faster to improve emisions at lower temps(when the car is warming up) Would so i guess the question is should i do a heated or can i even do heated on the 01 SC2? I live in washington state so its fairly rainy all the time.

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Old 03-16-2008, 12:39 AM   #2
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Default Re: O2 Sensor Question

Also where exactly is the 2nd O2 sensor? and should i replace them both? Im not getting any codes im just about to hit the 100k mile mark and want to get the jump on the 100k parts.

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Old 03-16-2008, 01:02 AM   #3
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Default Re: O2 Sensor Question

The downstream one, which is off the back of the catalytic converter, is heated because it can't always stay hot enough (600 degrees) itself. The primary one is on the exhaust manifold, and it doesn't really need to be heated anyways, it warms up in a minute or two already.

The rear one is basically only there to monitor the efficiency of the catalytic converter (has other uses too). Never waste money on getting a rear one until you have eliminate all other possible problems. Your 2001 is extremely picky with the oxygen sensors too, and you won't want to touch them if there are not DTCs in the PCM. If you were to have DTCs for both sensors at the same time, replace the front and then reset, and continure driving, and if a rear sensor code comes up, then you can continue to diagnose the problem.

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Old 03-16-2008, 01:29 AM   #4
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Default Re: O2 Sensor Question

What do you mean DTCs? What brand should I go with for the front one? Bosh?

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Old 03-16-2008, 01:37 AM   #5
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Default Re: O2 Sensor Question

You know, the trouble codes, ones that will light up the SES. I personally have had terrible luck with Bosch sensors, I always buy them straight from Saturn (which are nice Japanese ones). I'm sure other people will say Bosch worked well for them though, so don't take my word for it.

Just keep in mind though that the rear sensor doesn't normally need to be replaced. Usually the codes are just stating that there is too much oxygen coming through the catalytic converter, which could come from a million causes.

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Old 03-16-2008, 01:43 AM   #6
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Default Re: O2 Sensor Question

Ok so it would not hurt to just change the front one, without having any codes just as prevnative maint?

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Old 03-16-2008, 02:02 AM   #7
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Default Re: O2 Sensor Question

Well, again, if the PCM has nothing to say about it, then best not touch it. The 2001 has a LOT of parameters that the front oxygen sensor much meet and it is constantly monitored. Like I said, it is really touchy, if the sensor makes one false move, that SES light will come on.

Also, although this is a bit controversial, a nice "broken-in" oxygen is usually preferable as it may not be producing exactly as much voltage as it was new, and so the engine actually ends up using a bit less gas (sensor says it's at 14/7:1 when it really 15:1 or so) which is perfectly fine in most people's case.

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