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Trying to locate sensor 1 bank 1 O2 sensor on 3.8l impala. Have seen various diagrams, but not helping. I'm looking for a diagram or pic of exact location.
Thanks in advance.


   
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bank one is the bank that has the #1 cylinder. sensor 1 is before the cat. if you have the original coils the coil will have numbers on them telling where the cylinder are.


   
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I understand that sensor1 is before the cat, but cannot find it. Is it located on the exhaust manifold just forward the firewall?


   
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yes, it is


   
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