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Can anybody tell me where the oxygen sensors are located and what the thread size is on a 2009 Hyundai Elantra Touring, 2.0L, 4 cyl. engine? Thanks!
 

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There are two O2 sensors , one is right close to the engine behind the exhaust manifold heat shield, and the other is after the second catalytic converter; I believe.

There are special sockets that fit over the wiring pigtail that allow you to remove them ; standard size I think is 13/16 or around 21 mm.
 
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