Replace O2 Sensor and MAF
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  1. #1
    Junior Member Jmac0585 can identify a wrench
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    Default Replace O2 Sensor and MAF

    Can someone who has done this before show me where these things are, and are these something I can do myself. I have to get my car smogged, and was told that the CEL is telling me that these parts have to be replaced?
    Yeah, yeah, yeah... I know it may be simplistic, but you don't know what you don't know.
    Joel in Corona, CA

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  3. #2
    Acountabilibuddy ricerrx7 knows a lot about Elantras
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    Default Re: Replace O2 Sensor and MAF

    Which O2 sensor? Maf is the sensor in the intake tubing.
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    chef 4 life bdiggy can identify a wrench bdiggy's Avatar
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    Default Re: Replace O2 Sensor and MAF

    Yeah, you need to know which sensor is bad. The first one is the one in the hole in the heat shield right in the front of your engine bay. Kind of looks like a spark plug with a wire coming off the top of it.

    The MAF almost looks like an electrical plug plugged right into the middle of your intake pipe between the throttle body and the battery. When you unclip the piping around it the whole piece that that plug is plugged into comes out pretty easily.
    Last edited by bdiggy; 11-30-2010 at 04:20 PM.

  5. #4
    Junior Member Jmac0585 can identify a wrench
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    Default Re: Replace O2 Sensor and MAF

    Got the codes run = P1166.
    P1166 O2s (B1) Control Adaptation
    P1166 Limit O2s Lambda Control (B1)
    Last edited by Jmac0585; 12-18-2010 at 02:36 PM.
    Joel in Corona, CA

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    Junior Member Jmac0585 can identify a wrench
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    Default Re: Replace O2 Sensor and MAF

    This is the bank 1 I assume. can someone tell me or better show me where this one is?
    Joel in Corona, CA

  7. #6
    Acountabilibuddy ricerrx7 knows a lot about Elantras
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    Default Re: Replace O2 Sensor and MAF

    We only have one bank, but it is the one before the cat. Look at your exhaust manifold, it's the only sensor on there.
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    Poster God mtlelantra knows a lot about Elantras mtlelantra's Avatar
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    Default Re: Replace O2 Sensor and MAF

    The sensor on the exhaust manifold might be really on there tight. You'll probably need a breaker bar or impact wrench, and do it when the engine's cool so you don't burn yourself.

    I don't have the answer for this- but for anyone who's done it- is antiseize recommended to help with the thread seal?
    2004 Hyundai Elantra VE 2.slow
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  9. #8
    Junior Member Jmac0585 can identify a wrench
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    Default Re: Replace O2 Sensor and MAF

    Is the circled plug the O2 Sensor I need to replace?
    http://img.photobucket.com/albums/v283/Jmac05/12.jpg
    Joel in Corona, CA

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    Junior Member salvorhardin has not yet proved knowledgeable salvorhardin's Avatar
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    Default Re: Replace O2 Sensor and MAF

    Yeah, that's the one.

  11. #10
    Junior Member Jmac0585 can identify a wrench
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    Default Re: Replace O2 Sensor and MAF

    Quote Originally Posted by salvorhardin View Post
    Yeah, that's the one.
    Thanks dude.

    Is that one considered the
    "upstream" or the "downstream"? I am assuming it's the upstream.
    Also, once I replace that do I have to clear the code manually to get the CE light to turn off, or will it go off by itself?

    California part?!
    http://www.rockauto.com/catalog/rafr...188529-1163579
    Joel in Corona, CA

  12. #11
    Junior Member salvorhardin has not yet proved knowledgeable salvorhardin's Avatar
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    Default Re: Replace O2 Sensor and MAF

    It's considered the upstream sensor. You might consider calling local dealers to check the price on it, a couple of weeks ago I priced out the sensor and a local dealer had it for $80(most expensive $130). Also, check to see how many wires are on the electrical connector. Mine looked to be the 5 wire connector (wider than 4 wire normally pictured). The CEL will turn off by itself after a few times the car is started. For passing smog check I don't know if it will be faster to just clear it with an obd scanner.

  13. #12
    chef 4 life bdiggy can identify a wrench bdiggy's Avatar
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    Default Re: Replace O2 Sensor and MAF

    5 wire is CA emissions, but somehow I ended up with it in my CT Elantra, and to replace it at the dealer is $178 for the sensor. I wish I could get them for $80!

  14. #13
    Acountabilibuddy ricerrx7 knows a lot about Elantras
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    Default Re: Replace O2 Sensor and MAF

    Actually, looking at the codes, are you sure it's not a mixture problem?
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    Poster God mtlelantra knows a lot about Elantras mtlelantra's Avatar
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    Default Re: Replace O2 Sensor and MAF

    I can mean both...
    2004 Hyundai Elantra VE 2.slow
    One of the few 138 HP ULEV XD2s in California.

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