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If you see the code 4C5E on your BMW diesel vehicle, it means there is a problem with your diesel particulate filter (DPF). This code usually goes hand in hand with the code 4CF3, which points to an issue with the exhaust backpressure sensor. If you get both codes together, the backpressure sensor is likely the main culprit, and you may need to replace it. When you only receive the 4C5E code without any other codes, then it's likely that your DPF is the source of the issue, and you may need to either clean it thoroughly or consider replacing it.
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The code 4C5E in a BMW signals a problem with the particulate filter system.