Ka preheating lamp issue

Sounds familiar. I had a similar issue with my old Opel Corsa – preheating light stuck on and engine light glaring at me. In my case, it was also related to the glow plugs. Did you check the glow plugs themselves or just the control unit?

I've only focused on the control unit so far. How did you figure out it was the glow plugs and not something else in the system? Any specific tests you ran or signs you noticed?

For me, the mechanic ran a diagnostic check that pointed directly to the glow plugs. But before that, I noticed rough idling, especially on cold starts, which is another sign. Honestly, it's probably best to get it checked out professionally, unless you have the diagnostic tools yourself.

Thanks for the advice! I took it to a workshop, and you were spot on – it was indeed the glow control unit and, as I suspected, a faulty connection. They replaced the unit and fixed the wiring; cost me about 95€. The preheating light is behaving normally again, the engine light is off, and the smoke is gone. Appreciate the help!