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check engine code po422 850

posted by  REP on  Tue Jun 11 11:03 CST 2013
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last visit: Mon Jun 30 14:33 CST 2014
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Last year in August I replaced all the fuel lines, fuel filter due to error codes. I also replace all of the vacuum lines and elbows due to error codes. At the same time I also replaced the flex pipe on the manifold unit. Then I replaced both the front oxygen sensor and rear oxygen sensor only to find out that the cat. converter was dead. So, I got a new cat for the car as well.

Since august I put about 3800 miles on per month and now I just started to get the po422 code. Why? What failed? What should I replace now? Could oxygen sensors and/or a cat die that quickly? Or is there something more serious that I'm missing?
The car is an '96 Volvo 850 GLT Wagon with just under 230k on it now.
Thanks.






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