Cat light flashing

[humdigadi]

So after a few weeks of owning my D2 PF V8, I'm finally figuring out why it was so cheap!

The first thing to fix is the exhaust. I was driving down a dual carriageway today at a steady pace when the cat light started flashing on the dash. I knew the exhaust was blowing and by the sounds of it it's got worse although nothing has fallen off. It started running a bit rough too but it still has plenty of power.

My question is, would an exhaust failure cause the cat light to flash or does it mean that one of the cat's is genuinely goosed too?

Thanks, Matt