How do you repair the codes on a Mercedes 430 s-class p0303 and p0203?

To address the P0303 and P0203 codes on a Mercedes S-Class 430, start by diagnosing the misfire in cylinder 3 (P0303) and the injector circuit issue for that cylinder (P0203). Check the spark plug, ignition coil, and fuel injector for cylinder 3 for any faults or wear. Inspect wiring and connectors for damage or corrosion. If necessary, replace any faulty components and clear the codes, then test drive the vehicle to ensure the issues are resolved.