Peugeot 308 1.6 VTI exhaust emission problem.

Hello, I have a Peugeot 308 1.6 VTI with only 143,000 km on the odometer. Since we recently bought it, I want to have all the necessary repairs done. Initially, the engine fault light was on. We connected the car to a diagnostic computer, and it showed four error codes. We cleared them all, but after driving 10-15 km, the light came back on. When we connected it again, it showed two more error codes related to the valves. The car was also experiencing slight jerking between 2000 and 3000 RPM while driving. Is this problem related to the valves, or is it somewhere else? How can we solve this problem? I have photos of the fault codes; I can send them to anyone who requests them. Thank you in advance. Can Polat, 2025-12-14 17:02:26

When we first connected the car, it showed two exhaust-related errors, which we cleared. When it restarted, it didn't show those errors again, but it showed the valves again. However, the dashboard is giving a warning that the vehicle has an exhaust emission fault.