01 VW Beetle 2.0 automatic

We purchased this bug a few weeks ago. We are getting a P0327 error code which is for #1 knock sensor. The car only has one knock sensor in the #2 position. There is no wiring for the #1. One mechanic said it only has one sensor. So why are we getting a code for a sensor that is not there. We have changed the #2 sensor and checked the wiring, still getting the code.