Renault didn't even sell a thousand cars in China last year, and the GAQSIQ didn't specify what could have been so wrong with those four cars that they deserved a ban. It has only said that Renaults "have many times revealed quality problems" and urged the company to check its Chinese-market cars thoroughly. We have no idea what the technical and safety issues could be, but based on some of the Chinese cars being sold... well, you know the one about glass houses, right?
[Source: Automotive News, sub. req'd]