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.

 

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??

 

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.

 

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 ?

 

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

 

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.

 

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.