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Is the second o2 sensor needed?

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nightram
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2012/04/27 18:30:28 (permalink)
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Is the second o2 sensor needed?

Like the question in the heading, is the lower o2 sensor of a sw20 needed? What does it do?
 
I am having a delema, I put a aftermarket dump pipe similar to this http://www.ebay.com.au/it...10cd8551#ht_1118wt_905 . The top hole I have the cars o2 sensor, the middle has a a AEM Wideband 02 sensor, and the bottom, has well, nothing. The OEM sensor does not fit any holes but I would like to know what it is for. Does it do anything in particular, is it there just for CAT failure warning. Is it even needed?
 
If it is needed I will more than likely buy a generic 2 wire sensor and wire it in.
 
Thoughts from the pro's?

1989 MR2 GT (SW20) 325hp, sold to buy a Jeep

I guess "you wouldn't understand"
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    just_ace
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    Re:Is the second o2 sensor needed? 2012/04/27 21:10:20 (permalink)
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    Dont need it. Just the cat temp sensor. Useless
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    blacky83
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    Re:Is the second o2 sensor needed? 2012/04/27 22:15:22 (permalink)
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    +1, its only a temperature sensor. Might throw up an error light, but definitely won't effect the engine.
    #3

    nightram
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    Re:Is the second o2 sensor needed? 2012/04/27 22:35:54 (permalink)
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    righto! ill get it welded, or find a bung.

    1989 MR2 GT (SW20) 325hp, sold to buy a Jeep

    I guess "you wouldn't understand"
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