Red/Amber
The colour helps indicate urgency, but exact behaviour can vary by manufacturer.
Dashboard Warning Light
Exhaust / Catalyst Overheat
Exhaust or catalyst temperature is dangerously high. The usual first step is: Stop safely away from dry grass or flammables and follow the manual.
Stop safely
Use this as a quick triage label before confirming in your owner manual.
Stop safely away from dry grass or flammables and follow the manual
Check the matching manual page for your exact brand, model and year when possible.
What it usually means
Exhaust or catalyst temperature is dangerously high.
What to do next
Stop safely away from dry grass or flammables and follow the manual. If the vehicle feels unsafe, stop in a safe place and arrange professional inspection.