Runflat tyres roar significantly on after 20,000 kms. Reports that tyre pressure monitor does not always work when a runflat tyre deflates. Software problem on some automatics cause jerkiness. Steering rack may leak fluid unnoticed out of end seal and into track-rod end gaiter. Some report power steering pump failure under warranty. Faulty wiring harness or software problem may cause non-starting condition. Various random software problems with iDrive, memory seats, display LCDs and ABS module. Turbo models suffer from failure of the high-pressure fuel pump.