Skoda Scala AdBlue Issue

A completely empty AdBlue tank on a 2020 Scala with that mileage is unusual, but not unheard of. The dashboard alert and engine non-start strongly point towards a malfunctioning DEF injection system. Have you checked for any visible leaks around the AdBlue tank or the dosing unit? Also, can you read out the exact fault codes from the error memory? They can provide more specific insights than just 'AdBlue tank empty'. Make sure the tank capacity is enough for proper measurements.

Thank you for your reply. I haven't noticed any visible leaks, but I will inspect the area more thoroughly. Regarding the fault codes, I'll retrieve them and provide them to you as soon as possible with the next diagnostic run. Is there something specific I should pay attention to when inspecting the dosing unit?

Given the symptoms and your initial assessment, a defective AdBlue output is indeed a strong possibility. Carefully inspect the dosing unit for crystallization or blockages – this can happen with DEF fluid over time. However, given the age and mileage, internal failure of the pump within the AdBlue tank is also plausible, especially if you hear no pump activity during the start sequence. Ultimately, proper diagnosis requires checking the fault codes or having someone run guided function tests with diagnostics to check the complete injection system for proper function. Considering the symptoms, I would recommend taking it to a workshop.

I appreciate you confirming my suspicions. The Skoda dealer confirmed the defective AdBlue output. The repair cost around 250€, as anticipated. Thank you for your assistance.