Seat Ibiza Diesel Engine Issue

I recall a similar issue with my Ibiza, though I have a gasoline engine. Reduced engine power and rough idle were present. I suspect it may be related to the fuel system. Have you considered a filter replacement? Also, can you read the error codes? That could help narrow it down.

When you experienced that issue, were there any stored error codes related to the fuel filter heater? Also, was the filter replacement difficult?

Yes, there was indeed an error code related to the fuel system, however, it was not specifically linked to the fuel filter heater. Given your diagnostic, it would be wise to check the connection. If you are not comfortable with electrical diagnosis, I would advise consulting a workshop.

Confirmed resolution. Defective plug connection on the fuel filter heater. Repair cost 95€. Thanks for the input.