Hi guys. I have a problem with my rx350 2006. Engine fault with VSC on my dash. Fault code is P0174 system too lean bank 2. I have replaced MAF sensor as it was suggested. But still nothing.. Someone said that it would be lambda oxygen sensor bank 2 sensor 1... Anyone had a similar problem? Is this will resolve the issue..?

if you have access to a scanner. watch b1s1 and if you see the voltage move from .8v to almost 5v. this is normal. then its not the MAF. If it were, you would see it stuck at either near .8v or 5v. i dont remember if lower voolate means lean or rich. Either way. Go ahead and replace the b2s1 o2 sensor.

Thanks for reply.. I will get it replaced.

did this ever fix the issue?

I guess I'm in the same situation, since it is rich I have to check the fuel supply system (EVAP, fuel pump, injectors), and up/downstream sensors.