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Vaccuum Lines, rough idle and o2 Sensors/CAT V70-XC70 1999

posted by  someone claiming to be BoonBoon on  Wed Apr 25 15:59 CST 2007 [RELATED]

My car is running rough, but not too bad really. Yet my mechanic is telling me I have a failing CAT which I don't quite belive. I have a ECM code280A for the front o2 sensor. Could this be a vaccuum leak I am experiencing and not the sensors or the CAT. I have replaced the rear o2 sensor 2x. Would it be worth reeplacing all the vaccuum elbows and lines before the CAT? Is it resonable to expect the CAT to fail at 100k mi. And is it resonable to expect the vaccuum lines to crack with age tripping the o2 sensors and possibly the CAT?






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