What are the reasons for the engine exhaust fault light to illuminate?

[HZoe]

Engine exhaust fault light illuminates due to: 1. Poor fuel quality, leading to abnormal mixture ratio, electronic component failures, and exhaust system abnormalities; 2. Faulty electronic components in the intake/exhaust systems such as oxygen sensors, carbon canister solenoid valves, mass air flow sensors, turbocharger solenoid control valves, throttle body, or engine carbon buildup; 3. Engine control program requires updates or debugging. The engine exhaust system refers to the system that collects and discharges waste gases, typically composed of exhaust manifold, exhaust pipe, catalytic converter, exhaust temperature sensor, automotive muffler, and tailpipe.