Do the codes come back? P0016 ECM-643A Camshaft position, intake Signal too low P0016 ECM-643A Camshaft position, intake Signal too high P0017 ECM-644A Camshaft position, exhaust Signal too low P0017 ECM-644A Camshaft position, exhaust Signal to P0340 ECM-3000 Camshaft position (CMP) sensor, intake...

Also forgot to add, car runs and idles fine, from what I can tell. (Have nothing to compare it to)

Just bought my 2009 Volvo C30, carfax shows timing belt was changed within 10k miles of me taking ownership. CEL on with codes P0016, P0017, P0340, P0420. Any idea what these could be related to? New to Volvos, more of a subaru guy myself, but have always loved the C30’s.