IzzyBergman

Black smoke and loss of power in 2004 Peugeot 406 Diesel: Possible causes and solutions

Hi guys, I have a problem with my 2004 Peugeot 406 Diesel (mileage 161452 KM). When accelerating there is black smoke from the exhaust, the engine light is on, I feel a loss of power and the engine is not running smoothly. There is also the issue with the DPF not regenerating properly and the fuel consumption is also higher than usual. I suspect that there is a problem with the exhaust back pressure sensor on the diesel particulate filter. Have any of you had a similar problem? How did you deal with it and what did your garage say? I would be pleased to hear about your experiences. Thanks in advance!

(Translated from German)

A 2004 Peugeot 406 Diesel is experiencing black smoke, loss of power, an illuminated engine light, and increased fuel consumption. The suspected cause is a malfunctioning exhaust back pressure sensor on the diesel particulate filter (DPF), which is not regenerating properly. A similar issue was resolved by cleaning the DPF, which improved engine performance and eliminated the black smoke and power loss. It is recommended to have a professional diagnosis and consider DPF cleaning as a potential solution.

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4 comment(s)

Hi, I can understand how frustrating this can be as I had a similar problem with my 2007 Peugeot 407. I also had increased fuel consumption, loss of power and the engine light came on. My DPF was also heavily loaded, just like yours. I went to the garage and the guys there confirmed that the particulate filter was full and not regenerating properly. They had to remove the filter, clean it and refit it. That was quite a serious problem because a poorly functioning DPF can be very damaging to the environment and affect engine performance. Remember that only a professional diagnosis can tell you for sure what's wrong. But if it really is the DPF, like on my car, filter cleaning would be a step you should consider. I hope this helps and I wish you the best of luck with your car! Regards

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Hi, thanks for the tip, it looks like I have the same problem as you did. I think I'll have a look at the garage and have the DPF checked. Do you remember how much you had to pay for it? Have you noticed anything else since the repair that could be related to the problem? Thanks in advance and best regards!

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Hi, sure, I still remember the repair costs. It cost me €1325 to clean the heavily loaded DPF. It's not cheap, but it definitely makes sense. Since I visited the workshop and the exhaust back pressure sensor error on the diesel particulate filter was rectified, everything has actually been running like clockwork. I have to tell you, the DPF is an important thing and if it doesn't work properly, it can lead to serious problems. I definitely noticed a significant improvement after the repair, the black smoke and loss of power are gone and the engine is running smoothly again. I hope everything goes well for you too, fingers crossed! Best regards

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Hello, that sounds a bit expensive, but I guess I'll have to go through with it. A clean environment and a well-functioning car are worth the money to me. And if the engine runs properly again afterwards, it will have been worth it. Many thanks for the helpful information and words of encouragement! I'll be going to the garage soon and hope that everything will run well again afterwards. Thanks again and best wishes!

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PEUGEOT

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406