DS4 preheating lamp and check engine light

Sounds familiar! I had a similar problem with my DS4. Maybe the heating module is faulty? Check the control unit or the car preheater.

Thanks! Was your DS4 showing the same symptoms: preheating lamp, check engine light, and smoke? Do you remember the actual fault?

Yep, pretty much the same symptoms! Preheating lamp stuck on, engine light glaring, and smoke now and then. I tried to diagnose the electrical fault myself, but eventually took it to a workshop. They sorted it quickly.

Okay, that's helpful! A workshop visit is in my future. The mechanic found a defective preheating control unit and a faulty plug connection. The repair was 95€. Thanks again!