ReconJC Posted April 9, 2005 Report Share Posted April 9, 2005 I have a 1996 Eldorado and a PCO139 keeps coming up which is Bank 1 Sensor 2. Can anyone tell me which oxygen sensor this is? Link to comment Share on other sites More sharing options...
maydog Posted April 9, 2005 Report Share Posted April 9, 2005 I believe that the sensor is the one just before the catalytic converter. Link to comment Share on other sites More sharing options...
Ranger Posted April 9, 2005 Report Share Posted April 9, 2005 Maydog is correct. Bank 1 sensor 1 - right bank exhaust manifold (firewall side) Bank 1 sensor 2 - pre cat Bank 1 sensor 3 - aft cat Bank 2 sensor 1 - left bank exhaust manifold (radiator side) Link to comment Share on other sites More sharing options...
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