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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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New smog before or after O2 sensor change? [200][1990]
posted by  Rosy  on Tue Sep 28 13:09 CST 2010 >


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