Hi
it was good to get the second opion but it may not have been a good one. Although I dont know the exact circumstances what I do know is if you had multiple misfires this may cause raw fuel to enter the exhaust system which will cause harm to one or two 02 sensors. I have never seen all three go bad at once even in extreme conditions as far as the pcv valve just to prove a point it took me 32 seconds to change and that included opening the hood from the inside.
It may be you were misinformed about the 02 sensors by a not so informed shop hope this helps
jim
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Thursday, October 11th, 2007 AT 1:22 PM