ok so i went and bought a 02 sensor from autozone for my 1997 ek hatch (d16) and they were kinda lost so i was wondering if anyone know which o2 sensor is this?
its the heater circuit malfunction (Bank 1, Sensor 2).
is it the sensor on the cat or on the manifold?

thanks

 

like the code states.. sensor #2...

which is the secondary one on OBD2 cars...

it is the one after or in your cat.. not the one on top.. the one under it..