1998 Volvo V70 catalytic converter

1998 VOLVO V70
122,000 MILES • 4 CYL • FWD • AUTOMATIC
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YLLAS
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I insatalled a new catalytic converter and about after six months i am receiving po code 422. Does this mean the cat is bad?
Nov 27, 2009 at 11:25 AM
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MERLIN2021
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Either that or the downstream 02 sensor is switching too much, could be a bad sensor.


https://www.2carpros.com/forum/automotive_pictures/62217_P0430b_High_2.jpg


https://www.2carpros.com/forum/automotive_pictures/62217_P0430a_2.jpg

Top image shown normal efficency, bottom is low efficency. This can be seen with scantool set to read live data from the 02 sensors. Today's sensors are designed for 100,000 miles of service, you are over that, a fresh set of 02's might be needed anyway!
Nov 27, 2009 at 12:13 PM
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JIS001
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If you installed an aftermarket cat did they install an OBD2 catalytic converter?
Nov 27, 2009 at 8:00 PM
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