The BMW F30 3 Series Sedan 335i has a Inline 6, Petrol engine with 2979 cm3 / 181.8 cu-in capacity. The four most common problems with the N55 are, in no specific
BMW 3 Series misfire caused by faulty engine ECU. Engine misfire is a very common problem across the E90 range fitted with this engine ECU. The vehicle will begin to run rough and develop an engine misfire over one or more cylinders and will often get progressively worse over time. When diagnosing the problem using scan tools you will find
Changing the ECCENTRIC SHAFT SENSOR resolved my rough idle at start-up issue. Had it fixed in late 2018 and it has not come back. Dealer wanted $1800 but found a independent that specializes in BMW's who did it for $900. The shop was very familiar with this problem as it is a common failure. It seems the seal fails and oil gets into sensor.
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