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Emissions woes S70 1998

posted by  Gentleman on  Wed Jul 3 17:31 CST 2013
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last visit: Sun Jun 8 14:54 CST 2014
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Trying to get my 98 S70 to pass local emissions test for license plate renewal.

Started out showing rear O2 sensor was bad. Replaced rear O2 sensor with Bosch aftermarket and reset ECM.
Lambda light comes on again a short while later. Shows front O2 sensor is not keeping up with new rear O2 sensor. Replaced front O2 sensor with Bosch aftermarket and reset ECM.
Lambda light comes on again a short while later. Mechanic says I need a catalytic converter. Replace catalytic converter with "ultra series" aftermarket CAT as auto salvage yards here keep old CATs for scrap metal (platinum) value. New CAT from local Volvo dealer = $1200.
Anyway, reset ECM once again. Lambda light comes on again. Mechanic tells me O2 sensors are not coming online due to insufficient substrate in aftermarket CAT. Mechanic wants me to drive it for several days to see if sensors come online.

Was hoping to get another 18 - 24 months out of the S70 but I wonder if that is possible now.

Any ideas?








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    Emissions woes S70 1998

    posted by  Milanomike on  Thu Jul 4 09:06 CST 2013
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    last visit: Sat Oct 11 22:27 CST 2014
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    Who put in aftermarket O2 sensor, you or mechanic. My experience with the aftermarket O2 sensors is poor, I just bite the bullet and get OEM for these. Just my opinion, I'm sure others will chime in.








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      Emissions woes S70 1998

      posted by  Gentleman on  Sat Jul 6 16:33 CST 2013
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      last visit: Sun Jun 8 14:54 CST 2014
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      Milanomike:

      I was thinking the same thing. My mechanic installed the Bosch O2 sensors to try to save me money. I would like to try the Volvo OEM O2 sensors but they are expensive.

      The mechanic is blaming the aftermarket CAT saying they don't put enough substrate into the CAT to make it effective. My belief is it is the O2 sensors and I would really like to try the Volvo OEM sensors.

      So where do I go from here? Do I contact the rep for the make of the CAT and complain? or do I gamble on O2 sensors?

      Thoughts? Suggestions?







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