Mondeo preheating lamp and check engine light

I had similar issues on my Mondeo. Was the diagnostic test indicating a problem with the glow plugs?

Yes, the diagnostic test indicated a fault code related to the glow control unit, an electrical fault in the circuit. Did you also experience the engine light and smoke? Was it indeed a problem with the control unit, or something else?

Yes, I had the engine light and smoke as well. It turned out to be the glow control unit, as suspected. I would suggest bringing it to a workshop to confirm the diagnosis.

I had the vehicle inspected at a workshop. The diagnostic test confirmed that the glow control unit was defective, likely due to a faulty connection as I suspected. The repair, including the replacement of the unit, amounted to 95€. The symptoms have now disappeared. Your input was greatly appreciated.