Tiida Diesel Glow Plug Issue

Sounds like a glow plug issue. Does it idle rough when you start it, especially when it's cold? Any drop in fuel efficiency or engine light?

Yeah, now that you mention it, the engine idles a bit rough when I first start it in the mornings. Didn't connect it to the glow plugs, but it makes sense. Haven't seen any change in fuel efficiency or the engine light. Why is the rough idle such a big clue?

Rough idle happens because of incomplete combustion when the glow plugs aren't working right, especially when the engine is cold. They're key for ignition. Given the error code and what you're describing, a bad glow plug is likely. With those symptoms and the mileage, I'd get it checked by a good mechanic.

Thanks, that confirms what I thought. I've booked it in with a local mechanic. Replacing all four glow plugs will be about 440€. Thanks for the help confirming the diagnosis.