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SilkeRacer

Black smoke and loss of power in a 2018 Citroen DS4: experiences and advice

Strong exhaust smell

Loss of engine power

Check engine light on

Exhaust leak

Black smoke from exhaust on acceleration

Hey guys, I'm a bit worried about my 2018 Citroen DS4 with a gasoline engine and around 174604 kilometers on the clock. I've noticed that black smoke comes out of the exhaust when accelerating, the check engine light is on, I'm losing engine power and the exhaust is leaking. There is also this intense exhaust smell. I suspect it could be due to a malfunction in the exhaust aftertreatment system. I didn't have the best experience on my last visit to the mechanic and would like to hear your opinions and experiences. Who has had a similar problem and how did it go with your mechanic? Thanks in advance!

(Translated from German)

6 comment(s)


KWolf

Hi, I had a similar problem with my 2015 Citroen DS4. Theoretically it can have several causes, but in my case it was actually the defect in one of the lambda sensors. The lambda sensor measured the oxygen content in the exhaust gas and adjusts the engine management for optimal combustion. If it's not working, this can lead to increased fuel consumption and, in the worst case, affect the exhaust performance - which can probably lead to the symptoms you describe. The repair was relatively simple and straightforward - they had to remove the old sensor and fit a new one. Didn't really take long. Was a bit annoying, but definitely nothing major compared to other problems that can occur. Of course, there could be other causes, so I would recommend taking your car to a reputable garage and getting it checked out.

(Translated from German)

SilkeRacer (Author)

Hi, thanks for your input! That definitely sheds some light on things. Your experience sounds pretty much identical to what my DS4 is going through. I hadn't even had the lambda sensor on the screen. Good point. Can I ask approximately how much it cost to replace? Have you had anything similar crop up again since then? Must finally make my way to a trustworthy garage after this. Just need to find the right one, which is sometimes easier said than done.

(Translated from German)

KWolf

Hey, I'm glad I could help you! It cost me €375 to replace the lambda sensor. Since I went to the mechanic, the exhaust aftertreatment malfunction has been fixed and I haven't had any more similar problems. So, yes, I would definitely recommend you find your way to a garage you trust. It's a bit of a pain sometimes, but it's worth it in the end. Hope this helps you!

(Translated from German)

SilkeRacer (Author)

Great, that's really good news! If it's only about €375, then I'm more reassured. Your experience really gives me hope. So I will definitely take it to a workshop and hope that it goes as smoothly as you did. Thanks again for your valuable insights!

(Translated from German)

CarFreak

It sounds like a serious issue. Black smoke, loss of power, and the check engine light suggest engine or exhaust system problems. I would recommend getting a second opinion from a reputable mechanic. It could be related to the exhaust aftertreatment system. Anyone else experienced this?

CarlyMechanic

@CarFreak

It sounds like a serious issue. Black smoke, loss of power, and the check engine light suggest engine or exhaust system problems. I would recommend getting a second opinion from a reputable mechanic. It could be related to the exhaust aftertreatment system. Anyone else experienced this?

It's definitely a good idea to have your car checked by a professional mechanic. The symptoms you've described could be due to a variety of issues, including a malfunctioning fuel injector, a clogged air filter, or a problem with the engine control unit (ECU). However, given the black smoke and the intense exhaust smell, it's also possible that there's an issue with your car's exhaust aftertreatment system. This is a safety-relevant issue and should be addressed as soon as possible.

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