6 Causes Behind the Failed Catalytic Converter in BMW The catalytic converter does not have any moving parts, so it seems to be the most durable and long-lasting component in your BMW. In modern cars, the catalytic converter is developed with advanced technology, but still, it fails due to several reasons. It’s always important to fix the failed catalytic converter by recognizing the causes behind it. If you neglect the cause and don't fix it on time, then the problem will likely destroy the converter entirely and need replacement as well. The below-listed points are responsible for the replacement of installed catalytic converters in your BMW.
Exhaust system covered with unburnt fuel The fuel is burnt up in the combustion chamber for powering your BMW. But, when the unburnt fuel enters the exhaust system through the combustion chamber can ignite. When it reaches the catalytic converter during ignition can overheat the converter beyond its normal operational limit and cause melting down issues. Due to other reasons also the catalytic converter can overheat such as: ● ● ● ● ●
Bad oxygen sensor Improper fuel mixture Damaged spark plugs Failed fuel injector Damaged check valve
Faulty or bad spark plugs Generally, the spark plugs force the unburnt fuel to enter into the exhaust system due to the lack of misfiring. The reason behind is, the catalytic converter gets very hot. As a result, the unburnt fuel ignite inside the converter and partially or completely melting down the ceramic catalyst.
Structural damages in a catalytic converter The catalyst honeycomb which is located in a catalytic converter is commonly made up of thinwalled, lightweight, fragile ceramic material that is wrapped in a dense and insulated mat. The mat of the catalyst honeycomb protects the converter against damages. When the potholes, cracked exhaust hangers, or the speed bumps impact underneath the car it will strike the catalytic converter and fracture the catalyst.