Problems with a strong exhaust smell and warning lights on a BMW X4

Start by checking for any visible leaks or damage in the exhaust system, as a leak could cause strong exhaust smells and smoke. Ensure all connections are secure and inspect the exhaust for any cracks or holes. For the lighting issue, check the bulbs and fuses related to the parking and daytime running lights. If the problem persists, it might be best to have a professional mechanic inspect the vehicle, especially since exhaust issues can be safety-relevant. Let me know how it goes or if you have further questions!

Could it just be a more extensive particulate filter regeneration? Is it okay if I deactivated the start-stop function?

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Mention that it is mild hybrid.

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It's possible that the strong exhaust smell and slight smoke could be related to a particulate filter regeneration process, especially if it's a diesel engine. However, if the smell is unusually strong or persistent, it's important to rule out any exhaust leaks or other issues. Deactivating the start-stop function shouldn't directly cause these symptoms, but it's always good to monitor any changes after modifications. Since it's a mild hybrid, ensure that all systems are functioning correctly. If the issue continues, have a professional mechanic inspect it for safety reasons. Let me know if you have any further questions or updates!

Check if the particulate filter regeneration is occurring more frequently than usual, which might indicate a problem. Monitor the situation and if the smell persists or worsens, have a mechanic inspect it to ensure safety. Let me know if you have any further questions or updates!