Easiest way is to disconnect the positive terminal on the battery for a couple hours. This resets the computer log and the light will stay OFF until the problem occurs again and trips the light back ON.
Trouble code P0421 means: Catalyst Efficiency Below Normal (Bank 1)
The check engine light on a Mazda Tribute gives warning of potential problems. It can signal overheating, low oil, or engine misfires.
how to reset check engine light on 1992 Mazda mpv
If the check engine light is blinking , an engine cylinder misfire has been detected
Check the rear light wires, could be a short
A flashing check engine light means an engine cylinder misfire has been detected
I'm not sure but you may need to check the engine.
When the check engine light comes on, it's a good indication that something is wrong with your engine.
If the check engine light in your 2006 Mazda Miata is illuminated, it could indicate a variety of issues ranging from minor to more serious problems. Common reasons include a loose gas cap, faulty oxygen sensors, or issues with the catalytic converter. It's best to use an OBD-II scanner to read the trouble codes, which can help pinpoint the exact cause. Addressing the issue promptly can prevent further damage and ensure optimal performance.
ODO
OBD2 code reader plugged into port under dash, disconnect batt for a while. Note-clearing codes without repair will result in fault reoccuring so light will continue to come back on
There is no dedicated fuse for the light.