Polo 2008 1.2 BZG engine code has recently developed an intermittent fault with the power steering and the warning light. The battery was recently changed which did the trick, but has now come back on. AA told me the alternator was working fine... Any info would be appreciated, thanks.

When you turn the ignition key to the position where various warning lights illuminate, do you see the battery symbol light up?

Just to clarify; I mean the last position before the one where you trigger the starter motor into cranking the engine.

 

 

Thanks for the reply, I'm pretty sure the battery symbol lights up before cranking.

If it does, it's probably worth getting it scanned as the next stop after the alternator sense wire is normally the angle sensor, which is a bit of a idiot to do without the car on a lift. 

Thanks for the advice, will get the car scanned asap.

Double check that the battery light comes on like he said though. There's two thin wires that run along the bottom of the radiator support to the alternator. These are prone to breaking, and that light is the tell tale sign. They're fairly easy to find - trace them back from the alternator, there's a multiplug under the front panel that can be the cause. No point going in serious scanning the car and playing with sensors if it's just a broken wire. 

Thanks for all comments. Topped up power steering fluid and a new alternator 90 amps, problem solved.