The P0016 code indicates a mismatch between the crankshaft and camshaft position sensors, which can be caused by a variety of issues. This could stem from a faulty camshaft or crankshaft position sensor, which disrupts the engine's timing and synchronization. Additionally, problems with the timing chain or belt, such as slipping or stretching, can lead to this code by altering the relationship between the crankshaft and camshaft. Another potential cause is a malfunction in the variable valve timing (VVT) system, which relies on precise timing to optimize engine performance. If the VVT solenoids are failing or there's oil contamination affecting the system, it can also trigger the P0016 code. The !7 code might be related to these timing or sensor issues, further indicating a broader problem within the engine management system. I recommend running a full system scan to identify any related fault codes across the vehicle's control modules. There should be codes stored that can help pinpoint the exact cause of these issues. You might need to take the car to a mechanic for a comprehensive diagnosis, but if you're comfortable troubleshooting further, the youcanic full system scanner is excellent for diagnosing all systems. Just ensure you use a full system scanner, as some tools might not read all vehicle systems and could miss important codes. I hope this helps and you're able to resolve the issues with your E320!