Code PO 138

S-10 1998, 4 cyl
Oxy sensor problem ???
Where is it?
Thanks

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)

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?

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]