Hey Guys

I recently started getting an engine light. VAG-COMed it and it turns out both (left and right ) rear O2 sensors are not reading correctly. What are the odds of both of these going at exactly the same time? The car only has 53K miles on it, so it seams early, but I may be wrong.

I found the universal Bosch replacements for around $60 each so replacing them is not that bad. I was just wondering if some kind of a vacuum or boost leak could be causing this?

Any advice would be appreciated.

Cheers
Massboykie