You need to change the upstream sensor
Bank one, sensor one is screwed into the exhaust pipe before the catalytic converter.
Bank one sensor one is above the converter.
Bank 1 sensor 2 would be the sensor after the behind the catalytic converter.
It is in the pipe next to the exhaust manifold.
on the driver side of the engine right below the cam sensor on the head.
Bank 1 means where number 1 cylinder is. sensor 1 is the O2 sensor before the cat. converter, not after the cat.
Bank 1 is the oxygen sensor either screwed into ,or above the catalytic converter. Bank 2 is below the catalytic converter.
Driver side end of the cylinder head.
Sensor two is closer to the muffler.
Rear camshaft seal bad. Replace. located behind cam sensor.
Camshaft Position Sensor A- bank 1 Circuit Malfunction
There are 2. Both are on the exaust pipe before and after the catalytic converter.