Before you remove and replace bits, check the wiring.
I had the same issue 3 years ago on my 2011 and it turned out the engine vibrated through the wiring loom, causing a short in the can bus. It happened in the loom under the battery tray and at the ecu connector.
Not enough of a tolerance in the design it seems.
So what was the solution (in terms of fix)?
Did it blow fuse?
I'm dealing with this stuff right now. Yellow steering wheel symbol popped up on my dashboard, and lost the EPS while driving, luckily on a straight line with no traffic around.
So I went to check all the suggestions that's available on the forum:
1. fuses - all good
2. battery - replaced with a friend's battery, still no EPS
3. checked the sensors, and wiring - all seems to be okay
4. ground connections - checked and cleaned
5. hydraulic fluid - it's been under the minimum when cold, but it was ideal when hot after some driving. I would ignore this as some of you just said, it shouldn't bring the yellow warning light anyway
No fault codes has been checked yet.
The car is a 2009 6J 1.6 16V BTS, I own it since 2013 and 30k km, current milage 127k km. Never had any problems with the EPS. It went bye bye, from one second to another...
So I'm hoping it's not the pump.
If it turns out it is, is it enough to just change the pump alone, or do I need to change the entire power steering rack ?
Thanks guys, this forum is gold