Clunking in Steering - Vectra C

[optimax sniffer]

I have a 2002, 2.0litre diesel vectra saloon. On my commute today I started to hear a clunking when I put a 1/4 turn or so of lock on, and the same when going back to the centre. I can also feel it slightly.

Any ideas?

Can't see anything hanging off, loose or wet...

[jenkotvr]

Cv Joint?