Endaar

Yeah, I would agree, but apparently there are two O2 sensors specific to the 350 F-Sport and they're not shared across the rest of the IS line. I think it's BS too but there's no incentive for them to not fix the car (I'm in a loaner) and they claim they simply can't get the part.

Ecko508

iTrader: (2)

So I have the same issue what did your code read? Mine read bank 1 and bank2 too lean? Did you have any mods on the car??

Endaar

I believe it was the left bank, but am not sure. The only thing on the repair order is "B1S1," and no, the car is stock.

Ecko508

iTrader: (2)

Did the fix totally repair the car? I just had my stock exhaust put back on and I'm bringing it to the dealer Friday, there is a small exhaust leak due to a bad gasket during the swap of exhausts, so they only replaced one sensor on yours? Covered under warranty ?

EdEWdGo

I don't recall what the exact code that appeared was, but the way it was running at the time it felt like it was running a little lean (based on throttle response). Car was/is stock

MWIS350

I had code PO172 and PO175 too rich, bank 1 bank 2. Well it turn out to be MAF Sensor on intake. Put new one on and had no code or check engine light since.

MWIS350

I had call dealer the O2 or Fuel Air ratio sensor both in front driver side and passenger side are the same. I just put in new one.