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emission control problem

posted by  DavidA on  Fri May 13 14:29 CST 2005
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Hello all,

My 1999 S70 has had an intermittent check engine light problem. An OBDII check revealed a failure in one of the O2 sensor circuits. The problem seems to be related to cold weather. Now that the weather has warmed, the light has not gone on (in over one month). However, I recently failed my state inspection emission testing as a query of the computer reveals several sensor circuits not ready for testing. I understand from the Volvo shop that there is a certain sequence of engine rpm required to reset all of the circuits. Thus far I have driven the car for a month without being able to reset the circuits. The Volvo shop won't tell me outright, but will charge me 1.5 hours of shop time to do it for me. Does anyone know of the correct sequence?








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    emission control problem

    posted by  MadeInJapan on  Fri May 13 17:40 CST 2005
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    last visit: Sat Oct 2 06:34 CST 2010
    [RELATED]

    I suppose that you've read this?
    http://www.brickboard.com/AWD/index.htm?id=956199
    Good luck. I did a search for "Emissions Test" here in this forum and there is tons of info. I think if you did a search here you'll find your answers.
    Good luck!
    David
    --
    1998 S70 T5 Emarald Green Metallic, 2004 V70 2.5T Ruby Red, Previous Owner of Black '94 850 Turbo Wagon








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      emission control problem

      posted by  DavidA on  Sat May 14 01:58 CST 2005
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      Thanks for the reply, MadeInJapan. Actually, I have looked into this before, and have posted a similar question previously. My dilemma is that I do not know what defines a "drive cycle". All advice seems to point to two cold starts followed by a drive cycle to reset the computer. However, I have had at least three dozen cold, not so cold, warm and hot starts followed by a variety of driving speeds and distances. Alas, the problem remains.

      There is apparently a very specific sequence of engine speed and time that will reset the computer. I don't know how long it will take for me to hit upon this in random driving, but I only have another 21 days until I have to pay for emissions testing again. The Volvo Dealer knows, but won't tell me, and it will cost me 1.5 hours of shop time for the Dealer to do it for me.

      Perhaps my search of the archives has been incomplete, or I am using the wrong keywords, but I have not been able to come up with an answer to my question, namely, what exactly constitutes a drive cycle?








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        emission control problem

        posted by  MadeInJapan on  Sat May 14 02:23 CST 2005
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        last visit: Sat Oct 2 06:34 CST 2010
        [RELATED]

        Have you tried disconnecting the battery for 30 minutes? I've heard that this sometimes works. You'll have to have your radio code to re-start your radio if you do this.

        I know I've read other posts here or maybe on sweedspeed.com about the actual sequence of speed and time. Keep searching and I'm sure you'll find it, or someone may post it here for you. I'll keep looking too and if I find it, I'll post back. Good luck!
        --
        1998 S70 T5 Emarald Green Metallic, 2004 V70 2.5T Ruby Red, Previous Owner of Black '94 850 Turbo Wagon







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