What does 'Check Exhaust System' mean?
1 Answers
Check Exhaust System refers to a malfunction in the emission system, which may trigger an alarm signal due to a dirty three-way catalytic converter or oxygen sensor; it could also be caused by poor gas combustion leading to system alerts. Alarm signal caused by dirty three-way catalytic converter and oxygen sensor: A car's exhaust pipe consists of three sections: the front pipe (header), mid-pipe, and tailpipe. The three-way catalytic converter is located in the front pipe, which is also known as the exhaust manifold. In most cars, the exhaust manifold can be seen by opening the engine hood. The three-way catalytic converter may fail after prolonged use, and if it fails, it could cause the engine warning light to illuminate. The role of the oxygen sensor in the exhaust system: Most cars have two oxygen sensors—one located behind the exhaust manifold and another behind the three-way catalytic converter. The oxygen sensor detects the oxygen content in the exhaust gases and relays this signal back to the ECU.