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    Thread: Bank 1 Sensor 2 location

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      Bank 1 Sensor 2 location

      Where is Bank 1 Sensor 2 located on a 2004..?? I see one when I open the hood right by the dipstick, is there another one hidden...?

      I know on my girlfriends impala the same sensor was on the backside crammed against the firewall....



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      Administrator Daox's Avatar
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      There is one after the CAT.

      All 96+ vehicles have an O2 sensor after or in the exhaust manifold. A V6/8 has one in each manifold (bank 1 & 2). They also have and one after the catalytic converter. If the engine has two CATs you have a sensor after each of them (sensor 1 & 2). Thus the nomenclature of the bank 1 sensor 1, bank 2 sensor 1, etc.

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      Ok, I was underneath the car and didn't see any after the CAT, unless I'm not looking in the right spot...?

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      should be right before the flex joint...

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      Quote Originally Posted by seatbeltpads View Post
      Where is Bank 1 Sensor 2 located on a 2004..?? I see one when I open the hood right by the dipstick, is there another one hidden...?

      I know on my girlfriends impala the same sensor was on the backside crammed against the firewall....
      bank 1 sensor 2 is after the catalytic converter. on any vehicle, bank is the side of the engine, bank 1 is the side of the engine with cyl 1. sensor 1 (whether its bank 1 or bank 2) will always be before cat, sensor 2 (whether bank 1 or bank 2) will always be after (in some case, actually IN the cat) cat. Also, on most newer vehicles, sensor 1 is also referred to as heated O2 or air/fuel ratio sensor

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      Name:  IMG_0497.jpg
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Size:  72.0 KB hope this helps, taken from the passenger side

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      Thanks Jayman, that helps. Now all I need is to get a new sensor, tired of the CEL on all the time.



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