Ford Ka P0300 Code: Diagnosis and Recurring Check Engine Light

Hello everyone, I'm experiencing a recurring P0300 code on my Ford Ka. I've already performed a thorough inspection including wires, spark plugs, coil, injectors, crankshaft position (CKP) sensor, camshaft position (CMP) sensor, catalytic converter, and fuel pressure—all of which appear to be within normal range. After clearing the DTC, the check engine light turns on again shortly after driving. I'm seeking advice on possible causes or next steps for diagnosing this persistent issue.