Audi A4 Engine Problems and Smoke Issues - Need Detailed Insights

Start by checking the battery and its connections, as a weak or failing battery can cause starting issues and affect the ignition. Ensure the terminals are clean and secure. For the smoke, inspect the engine oil level and look for any leaks, as burning oil can produce smoke. If the problem persists, it might be wise to have a mechanic inspect it, especially since smoke can indicate a more serious issue. Let me know how it goes or if you have any further questions!