Amber/Red
The colour helps indicate urgency, but exact behaviour can vary by manufacturer.
Dashboard Warning Light
Diesel Particulate Filter / DPF
Diesel filter needs regeneration/service. The usual first step is: Follow manual instruction.
Inspect soon
Use this as a quick triage label before confirming in your owner manual.
Follow manual instruction
Check the matching manual page for your exact brand, model and year when possible.
What it usually means
Diesel filter needs regeneration/service.
What to do next
Follow manual instruction. If the vehicle feels unsafe, stop in a safe place and arrange professional inspection.