This indicator light illuminates :
Catalytic Converter Description and Operation
Description
The catalytic converter of the gasoline engine is a three-way
catalyst. It oxidizes carbon monoxide and hydrocarbons (HC), and
separates oxygen from the oxides of nitrogen (NOx). ...
Repair procedures
Removal
1.
Remove the air cleaner assembly.
(Refer to Engine Mechanical System - "Air Cleaner)
2.
Remove the battery and battery tray.
(Refer to Engine Electrical System - "Battery")
3.
...