any BMW techs on here? Fault code help needed.

[johnfm]

I have posted this on other fora - but PH always comes up trumps so I'll give it a go here.

Wife has an E93 320i cab.

Not been running great - hesitant below 2000 rpm - quite badly sometimes.

Got an engine light last week.

Bought Creader V to read and reset DTCs.

Got two BMW specific codes - but the reader cannot tell me what they are. Googled and found one of them:

P114C - Post Catalyst Fuel Trim via Oxygen Sensor SYstem Too Rich (Bank 2)

P124C - NOT FOUND THIS CODE YET!

The 'freeze data' function captures data when an engine light is thrown. It had some trim data from the P124c error:

ST Bank1 3.11%
LT Bank1 -3.13%


ST Bank2 0.77%
LT Bank2 -5.77%

So, does this suggest bank 2 post cat sensor is knackered?

Which is bank2? Driver or passenger side?

I am not averse to taking this to a garage - but in my previous experience they tend to just read codes and change sensors, then when the problem persists just say 'that's modern cars for you' and change more sensors.

I want some proper, old fashioned diagnosis!!