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FuelTa

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

I own a 2021 BMW X4 and recently noticed a strong exhaust smell and a strange/unusual odor. I disabled the start-stop function using Bimmercode, and shortly after, the exhaust started emitting strongly smelling gases and slight smoke. The engine runs normally, without unusual noises. Additionally, I received an error in the BMW app and on the dashboard related to faulty parking lights and daytime running lights. What could be the cause of these problems, and how should I proceed to solve them?

(Translated from Romanian)

Summary of the thread

A 2021 BMW X4 owner reported a strong exhaust smell and smoke after disabling the start-stop function using Bimmercode, along with warning lights for faulty parking and daytime running lights. Possible causes include exhaust system leaks or damage, or a particulate filter regeneration process. Suggested solutions involve checking for visible leaks, inspecting exhaust connections, and examining bulbs and fuses for the lighting issue. If problems persist, consulting a professional mechanic is advised for safety reasons.

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5 comment(s)

CarlyMechanic

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!

FuelTa (community.author)

community_quotation:

community_author_wrote_on

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?

(community_translated_from_language)

CarlyMechanic

community_quotation:

community_author_wrote_on

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

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!

CarlyMechanic

community_quotation:

community_author_wrote_on

Mention that it is mild hybrid.

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!

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BMW

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X4