The check engine light is on and there is a rattle on start-up, though the oil level is correct.

Fault codes for crankshaft and camshaft correlation (P0016:78, P0017:78, P0016:94) returned after clearing and a 10-minute test drive. Live data showed approximately 10 degrees of variation at idle between the cam and crank signals. The concern appeared to be related to camshaft timing and possible variable valve timing (VVT) issues.