Seat Arosa Diesel Engine Concerns

That sounds frustrating! I had a similar issue with my old Renault Megane, also diesel. Rough idling, loss of power, the whole shebang. It turned out to be a faulty injector as well. Though, honestly, I suspected it was an electrical fault for the longest time. Did you happen to check the injector spray pattern before condemning the nozzle? Sometimes a good cleaning can work wonders, even if temporarily.

Thank you for your response. Regarding the spray pattern, I did not check it directly. I lack the necessary equipment for such a detailed examination. However, considering the age of the vehicle, I suspect simple cleaning might not suffice. What were the symptoms on your Megane before you ended up replacing the injector? I want to ensure this is indeed the problem and not something else.

You're right, age definitely plays a role. On my Megane, the symptoms gradually worsened. Initially, it was just a slightly rough idle, then came the black smoke, and finally the dreaded engine light. I tried injector cleaner additives first, but they only provided temporary relief. The engine stalling at idle is a pretty strong indicator, though. Given your Arosa's age, I would lean towards replacement being the more reliable solution. Honestly, I'd recommend a visit to a trusted workshop for a proper diagnosis before throwing parts at it. They can confirm the faulty injector and check for any other underlying issues.

I appreciate you sharing your experience. Took the Arosa to the workshop today, and the diagnosis confirms your suspicion: defective injection nozzle, likely due to clogging. Replacement is indeed necessary. They quoted me 515€ for the repair. Ouch. But considering the poor starting, increased diesel consumption, and the upcoming emissions test, I have no choice. Thanks again for your insights.