17125 - Torque Converter Clutch Circuit Performance or Stuck Off

[Sir WIll]

Interesting...

Drove the car for ages tonight to look into the problem a little more.

Drive at a constant 45mph, all is smooth no rev jumps.
Gear changes up and down all good, quick and smooth
Car accelerates as expected, kick down etc all good
Goes into Drive and Reverse quickly and no clunks
Does not stall or grumble in anyway

Looking at the codes again I now have P0155 (O2 Sensor Pre Cat), P0171 (System too Lean Bank 1) and P0174 System too Lean Bank 2).

All combined is never good and after cleaning the MAF its not made any change to the car.

It could be a hope the 17125 is linked the MAF/ 02 problem but its worth spending the few quid for new parts to check it out.