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It is the drivers side exhaust pipe, second O2 sensor down.
 

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Premium Member
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1,124 Posts
It's just called an O2 sensor. Tell the parts store which one you need and they should be able to fix you up. They are usually easy to replace if they are not rusted in place. You might try to spray it with some rust buster before you start, but make sure the pipes are cool first.
 
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