BMW 3 Series owners have reported 1 problem related to engine exhaust system (under the engine and engine cooling category). The most recently reported issues are listed below.
Catalytic permanent failure-replace, 08may14, 30kmiles. Oxygen sensor replace, 16jun14, 30kmiles. Extreme carbon build up-walnut blast cylinders,clean intake&exhaust side, 23mar15, 35kmiles. Replace injector, 08apr15, 35k miles. Replace nox sensor, 17apr15, 29kmiles. Diesel active tank failure 28 sept 15, 37k miles. Catalytic converter failure-part on back order, 28sept15, 37kmiles. Dsc rear sensor failure,07dec15, 38k miles. Above engine and related emissions faults caused poor mileage and poor engine performance and expensive repairs, likely to be needed again-specifically walnut blasting. Per BMW problem caused due to car being driven in city and not highway, "to blow it out"- luckily no accidents.
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all problems of the 2010 BMW 3 Series
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