What are the causes of exhaust system failure in GAC Trumpchi GM6?
3 Answers
GAC Trumpchi GM6 exhaust system failure may be caused by damaged oxygen sensors, loose or damaged intake pressure sensor connectors, or malfunctioning three-way catalytic converters. Below are detailed explanations of these causes: Damaged oxygen sensor: The oxygen sensor detects oxygen levels in engine exhaust and provides feedback to the ECU about mixture concentration. It is installed on the exhaust pipe before the three-way catalytic converter. Damage leads to increased exhaust pollution and requires direct replacement. Loose or damaged intake pressure sensor: Check for looseness or damage to the pressure sensor and replace if necessary. Three-way catalytic converter failure: The three-way catalytic converter is the most important external purification device in the vehicle's exhaust system. It can be repaired or replaced as needed.
My Trumpchi GM6 had the exhaust fault light come on last year, mainly due to a clogged particulate filter. After the China VI emission standard, all cars are equipped with this thing, and it tends to clog easily with frequent short-distance city driving. Later, I solved it by driving on the highway at high RPM for half an hour to raise the exhaust temperature and burn off the carbon deposits. In fact, poor fuel quality or overfilling engine oil can also cause this issue. Another time, the 4S店 said the oxygen sensor was corroded by road salt. You really shouldn’t modify the exhaust system recklessly—a friend of mine once installed a cheap aftermarket exhaust and ended up with the warning light on.
The most common exhaust fault is the poisoning of the rear oxygen sensor. If gas stations mix water into fuel or if you consistently use cheap fuel from small refineries, the platinum electrode of the sensor is prone to sulfur poisoning. If the front oxygen sensor fails, fuel consumption will skyrocket, and the exhaust will have a pungent odor. A leaking exhaust manifold can also cause a popping sound; I've encountered cases where aging gaskets led to seal failure. Catalytic converter failure is usually caused by burning oil, so cars with worn piston rings require special attention. Modifying the exhaust system requires extra caution—removing the GPF (Gasoline Particulate Filter) will definitely trigger a warning light and cause the car to fail the annual inspection.
