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Code PO 138joslinm 01-22-2012, 02:06 PM S-10 1998, 4 cyl Oxy sensor problem ??? Where is it? Thanks tempfixit 01-22-2012, 02:27 PM S-10 1998, 4 cyl Oxy sensor problem ??? Where is it? Thanks P0138ChevroletHO2S-12 (Bank 1 Sensor 2) Circuit High Input Bank 1 is always the side that #1 clyinder is on, this case it is the drivers side. Sensor 2 iis after the catalytic convertor (downstream) joslinm 01-22-2012, 02:35 PM P0138ChevroletHO2S-12 (Bank 1 Sensor 2) Circuit High Input Bank 1 is always the side that #1 clyinder is on, this case it is the drivers side. Sensor 2 iis after the catalytic convertor (downstream) so it should be on the exhaust pipe between the manifold and the cat? j cAT 01-22-2012, 07:12 PM so it should be on the exhaust pipe between the manifold and the cat? NO! driverside downstream of the cat converter. that means between the muffler and the cat converter. bank 1 driverside ///// sensor 2 near muffler[downstream] Automotive Network, Inc., Copyright ©2013
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