Even though the M range is the pinnacle of the brand, recalls can happen. This time the problem is due to dodgy bolts.
This BMW M-car recall is something a little different. What we understand from the bulletin issued by the NHTSA is that this recall comes as a result of a previously issued recall, but affecting a different component. A while back there was a recall on that necessitated a change to the slip joint in the driveshaft that somehow left the factory minus grease which could result in it ceasing up and . That change resulted in this recall thanks to reused bolts.
The NHTSA tells us that during servicing of the rear differential for a prior service action (the recall mentioned above), the rear sub-frame bolts may have been reused instead of being replaced. Re-use of the existing bolts may cause the bolts to loosen. This means they're a stretch bolt of some kind, like a cylinder head bolt. As you can imagine, bolts coming loose on a car is never a good thing, and on a high-performance car it's especially bad. The NHTSA goes on to say that loose rear sub-frame bolts may adversely affect vehicle's handling and control, which, as expected, can increase the risk of a crash, depending on what the car is doing when things come loose.
BMW will notify owners of the affected cars and dealers will replace the rear sub-frame bolts with new bolts, free of charge. The recall is expected to start on October 24, 2016. Some owners of 2016 BMW M2 coupes, 2015-2017 M3 sedans and 2015-2016 M4 models in both coupe convertible models will be affected. We're hoping M-car owners will be a little more in tune with their cars and would identify a knock or something not right before being ed by BMW.