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I am just replacing 2 of 3 on my 2000 Sienna, so I am willing to bet that 2001 also has 3. I am told that there is one IN the exhaust manifold, but there appear to be 3 on the Y shaped replacement part (appears to be at LEAST 3' long). I am on the sight to research exactly WHERE they are.
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∙ 16y agoThis answer is:
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