Will removing the catalytic converter trigger the check engine light?
2 Answers
Removing the catalytic converter will cause the check engine light to illuminate. Catalytic converter failure: When the catalytic converter fails, in addition to triggering the check engine light, it can easily lead to excessive exhaust emissions, engine ignition difficulties, carbon buildup, and incomplete fuel combustion. Effects of catalytic converter clogging: After the catalytic converter becomes clogged, chemical complexes adhere to the catalyst surface, with the most noticeable effect being reduced exhaust purification functionality. Consequences of catalytic converter clogging: If not cleaned promptly, it can cause engine shaking, stalling, and even shutdown. In severe cases, it may potentially lead to vehicle self-ignition.
I've been into cars for twenty years and seen many car enthusiasts trigger the check engine light after removing the catalytic converter. This mainly happens because the catalytic converter is responsible for purifying harmful substances in exhaust gases. Without it, the emission data in the exhaust pipe becomes abnormal. The oxygen sensors in the exhaust system monitor this data in real-time. When they detect anomalies, they alert the vehicle's ECU. To warn the driver, the ECU then illuminates the check engine light on the dashboard. It's not just the light—the car may lose power, experience jerky acceleration, and see increased fuel consumption. Once, a neighbor of mine removed it for convenience but failed the annual inspection and was fined several hundred yuan. That's why I always advise against tampering with the factory catalytic converter when modifying the exhaust system. If replacement is necessary, go to a reputable shop with compliant parts to avoid that annoying light ruining your drive.
