The first time I had a Mk4 for a test drive, I tried putting my iPhone on the wireless charging pad. The wireless charging of my phone immediately broke. It made a short charging sound and then never charged wirelessly again.
Luckily the phone was repaired on warranty (replaced back plate, motherboard and battery), but I am still very wary of wirelessly charging my phone in my Mk4.5. I do charge my phone with my MagSafe charger every time though.
Common sense tells me one can't break the phone with even a faulty wireless charging pad, but I'm still too scared to use the charger in my car.