Vauxhall Astra G Diesel - engine electronics immobilizer warning light - JRW02

Hello. The engine electronics immobilzer warning light came on this afternoon on my Astra diesel estate. (The yellow light showing a car and a spanner through it). It goes off when I brake to stop at junctions and the car was driving as normal for the 10 miles that it took to get home. Does anyone have any ideas please. It is an 02 reg so an older car but has been very reliable. Hoping this isn't going to be expensive.... Thank you.

Vauxhall Astra G Diesel - engine electronics immobilizer warning light - elekie&a/c doctor

The yellow light is the engine systems malfunction light.This covers a multitude of faults.You will need to get a diagnostic test done to establish what faults are logged.