I hardly think having to get the stereo updated to have Bluetooth work with a particular phone makes the car a lemon. The article is sensationalist.
Keep in mind the cars are designed and part supply sorted well before the car is made, mobile phone technology moves way faster as they are heaps easier to make.
Multiple reasons, exhaust restrictions could be one.
A dud Injector can cause that cylinder to ping, as it's running leaner, and can't be picked up by a single wideband.
Sounds bad. The rest of the article says the issues, and it's hard to say the cars are lemons based on, for example, blue tooth connectivity issues, which was the most common.