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smog before or after O2 sensor change? 200 1990

posted by  Rosy on  Tue Sep 28 13:09 CST 2010
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last visit: Fri Oct 22 18:15 CST 2010
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Since my codes tell me I am running lean or rich (113, 121)....should I wait until after I have the O2 Sensor installed to smog or can I just go ahead and smog it Friday? The codes were cleared and it reads 1-1-1. No check engine light is on at this time, but I am certain it will be on in roughly two weeks.

Rosy
90 240DL








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    smog before or after O2 sensor change? 200 1990

    posted by  oscarcat on  Tue Sep 28 14:24 CST 2010
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    last visit: Sat Jan 28 19:31 CST 2012
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    Listen for or have a trained ear listen for a bad [leaking] exhaust manifold gasket. What can happen in an otherwise good running Volvo is the bad gasket allows air to be sucked into the exhaust stream which changes the O2 sensor reading. RESIST the temptation to TIGHTEN the bolts holding the manifold. The bolts will shear off. Sometimes a "bad" O2 sensor is misdiagnosed because of the aforementioned leaking gasket. If you are not mechanically inclined find a mechanic who has experience with 200 series Volvos and can diagnose problems, not just replace parts. Wouldn't you hate to spend money to replace the O2 sensor and still not have it pass smog?








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    smog before or after O2 sensor change? 200 1990

    posted by  Jorrell on  Tue Sep 28 13:15 CST 2010
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    With those codes, you will fail smog, no question. Resetting the codes does not "magically" correct the tail pipe emissions. DAMHIK.

    jorrell
    --
    92 245 291K miles, IPD'd to the hilt, 06 XC70, 00 Eclipse custom Turbo setup...currently taking names and kicking reputations!







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