Two problems related to crankcase (pcv) have been reported for the 2015 BMW 328. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2015 BMW 328 based on all problems reported for the 2015 328.
The engine intake tract, pcv infrastructure, and the main lower engine wiring harness loom failed due to improper reassembly during federal safety recall 24v-608. The technician left the main intake coupler completely loose and spinning freely by hand, and left the maf sensor crooked. This introduced a massive unmetered air leak and severe vacuum leaks. Simultaneously, the technician over-tensioned, pinched, or damaged the cylinder 2 wiring loom components. The vehicle is currently parked dead and untouched at my residence, and it is 100% available for immediate federal or corporate inspection. The unsealed intake tract and damaged wiring harness caused the engine to run dangerously lean at highway speeds. This resulted in sudden, violent engine shuttering, rapid deceleration, severe mechanical engine knocking, and a terminal cylinder 2 misfire. This component failure caused an immediate loss of vehicle propulsion on a high-speed public highway, creating an extreme risk of a high-speed collision and leaving the vehicle completely disabled. The issue has not yet been physically inspected by a third party because the vehicle is unsafe to drive. I went to the originating dealer (BMW of henderson) in person on July 16, 2026, to coordinate a safety re-inspection under an active BMW north America corporate case. Dealership management actively obstructed the safety process, gave technically impossible justifications regarding the recall execution, and flatly refused to dispatch a complimentary flatbed tow. They attempted to hold the safety re-inspection hostage behind out-of-pocket customer towing costs and upfront retail diagnostic fees. There were 0 mechanical warnings or symptoms prior to the recall. The vehicle was meticulously maintained with 5,000-mile oil changes and a perfectly tight timing chain. The severe drivetrain malfunction warnings, violent front-end shaking, and terminal engine knocking appeared after picking up my car.
Vehicle is 100% BMW serviced for it's history, showroom to present. Vehicle had been smoking after sitting 2-3 days and driving. We'd park and see wisps of smoke coming from the wheelwells and engine bay. Alarming! never witnessed open flame, but as the saying goes, if there's smoke. . . Questionable component: 328xd fuel sensor probe (BMW part #13-53-8-594-893 fuel feed line 135040 ) complaint/report pertains to fuel sensor probe failure and resultant fuel propagation(backfeeding/leaking fuel from sensor connection) into adjacent wiring/engine bay foils. Diagnostic system did not report sensor failure until extensive damage and hazard was realized. BMW USA responded to report as not covered by warranty(high mile vehicle) and therefore not of responsibility of BMW. According to local BMW service team the event is not unusual and that several vehicles with same fail/error codes have exhibited similar fuel leakage/propagation/damages. Very probable fire hazard costly repairs; if system had detected failure when sensor failed we would have had it fixed. We reported the smoking several times but the service department didn't isolate the problem. We continued to drive the vehicle cross-country for 6+ months; each time the problem got worse. We got lucky repair bills came to almost $10k by the time we added all visits and the entire wiring bundle that had to be replaced due to fuel damage. Failed sensor repair is around $750? BMW needs to implement a way to mitigate this problem to keep from having some potentially catastrophic/lethal endings. Similar problems that have contributed to vehicle fires in these BMW vehicles: 1) heater box malfunctions 2) pcv valve 3) coolant leak.