Seat Altea Electrical System Problems

Electrical gremlins are the worst. I experienced something similar with my Altea. The navigation was dead, and the onboard diagnostics gave random errors. Have you checked the vehicle software version? A software change might be all that's needed.

How did you determine it was the software, and what steps did you take to resolve it?

That sounds familiar. I spent a lot of time trying to fix it before discovering it was the software. The garage ran onboard diagnostics that indicated an implausible signal from a control module. They recommended a vehicle software recalibration. I'd recommend booking it in, as it will save you a lot of trouble.

Took it to the workshop, they recalibrated the control module software. That seems to have resolved the issue. Thanks for the assistance, it's really appreciated.