2009 Toyota Venza Q&A

2009 Toyota Venza Question: where is the 02 sensor located and how can I replace it

My check engine light and vsc light and track light came on - car running rough - can it be a vacuum leak or 02 sensor needs replaced? We checked engine light with hand held diagnostic computer and it read codes P0300 P0302, P0304, P0304 ---Car only has 36k miles on it to date -
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