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.
Bank 1 means where number 1 cylinder is. sensor 1 is the O2 sensor before the cat. converter, not after the cat.
on the driver side of the engine right below the cam sensor on the head.
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.