What are some of the bmw 1 series catalytic converter problems?

The BMW 1 Series catalytic converter problems are sulfur smell and dark exhauSTSmoke. The coolant needs to be changed every 60,000 miles or so. Your air filter needs to be changed every 15,000 to 30,000 miles or so. The spark plugs need to be changed every 100,000 miles or so unless it's a copper one. A cooper spark plug needs to be changed every 30,000 miles or so. You will come into many issues with an engine. A dire problem is the engine overheating. This may lead to car fires and the vehicle exploding. There could be excessive oil use, requiring the oil to be changed quickly. A spark plug may come off, causing engine issues. A gasket may become loose and that needs to be tightened up. You can have oil leaks and those need to be repaired quickly.