Why would the service spanner come on when you get to 80mph and not go any faster on your vectra?

The service spanner light on a Vauxhall Vectra typically indicates a fault or issue with the vehicle’s systems, often related to the engine or transmission. When the car reaches 80 mph and does not accelerate further, it could be due to a speed limiter or a protective measure activated by the vehicle’s onboard diagnostics to prevent damage. This could be linked to issues like engine overheating, transmission problems, or a malfunctioning sensor. It’s advisable to have the vehicle checked by a mechanic to diagnose the specific cause.