I have a 2005 Cadillac STS (4.6 L) and just got a code P0340. What concerns me is it definition “Camshaft Position Sensor A Circuit (Bank 1 or single sensor)”. First, should I replace the sensor and wait to see if the code comes up again or do I need to check the continuity of the circuit(s)? Second, what’s the location of Bank 1 on this particular engine? I know these sensors are inexpensive and I hope to replace it myself to save some money. Any help would be appreciated. Thanks in advance.