I recently just bought my first z (2006 roadster) and when I bought it I had two codes: p0340 and p1078 (exhaust valve timing control position sensor bank 1). I replaced the camshaft position sensor, which got rid of p0340, and I also changed the Vvt bank 1 selenoid, but p1078 still remains. I’m going to replace the crankshaft position sensor, and also the spark plugs, but I want to know if anyone else had this code and what they did to fix it.