Amber
The colour helps indicate urgency, but exact behaviour can vary by manufacturer.
Dashboard Warning Light
Glow Plug
Diesel preheat or diesel engine fault. The usual first step is: Wait/start; service if flashing.
Inspect soon
Use this as a quick triage label before confirming in your owner manual.
Wait/start; service if flashing
Check the matching manual page for your exact brand, model and year when possible.
What it usually means
Diesel preheat or diesel engine fault.
What to do next
Wait/start; service if flashing. If the vehicle feels unsafe, stop in a safe place and arrange professional inspection.