Vauxhall Vectra Washer Fluid Warning

Interesting. Faulty sensors can be tricky. Have you checked the spray jets themselves for any blockages? Sometimes a simple blockage can trigger false readings, especially if the system detects a pressure drop when trying to spray. Worth a look before diving into more complex diagnostics.

Spray jets are clear. Could it be the pump motor? I've had pumps fail before on other cars.

Indeed, the pump motor is a distinct possibility. Given the stored error code and the system's complete inoperability, a failing or completely failed pump motor aligns with the symptoms you're experiencing. Given the error stored in the error memory, I would advise visiting a workshop to get a complete diagnostic.

You were spot on. It was the pump. Cost me 25€ for a new one, fitted it myself. All good now. Thanks!