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Old 04-21-2013, 12:09 PM   #5
CotyM
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From this post that I found by googling your question: Question about post-cat O2 sensor

I found these images:





Now that you know were the vacuum lines begin on your car's intake manifold you can follow them using this routing diagram:



And of course you can always just smoke the lines to find your problem:


https://www.youtube.com/watch?v=zMok2y05jNE&NR
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