2002 Sonata 4 cyl. OBD II CODE P0340 Camshaft Sensor A....Help....

OBD II CODE CAME UP: P340 Camshaft position sensor A-Bank1 circuit malfunction. Sensors are located on no.2 & 4 spark plug. Earlier post stated no.4 plug determines the cadence of the timing of the spark plugs. Car was idling rough before she would not start anymore. Yellow error code was on. Any idea's gang?

My 2006 Sonota V6 3.3 suddenly paused & stopped accelerating. Even when flooring it no acceleration nor rpm increase. Got error code P0346 (Bank A Camshaft Position Sensor) and a few other codes indicating cylinders 2 and 4 misfiring). Btw, Bank A is Bank 2, affecting Cylinders 2, 4, & 6. There are 2 cam sensors onthe V6 3.3. Bank A or 2 is located on the front right of engine closest to radiator. Fairly easy to access and replace. But after replacing and leaving battery disconnected for 2 hours, car still won't start and I don't know why (battery still has plenty of juice). Does anyone know the next step.
I need help. I'm clearly not a mechanic. I only posted what I've learned so far to hopefully help someone along the way.