2003 Toyota Highlander CEL code 1150

My CEL came on. I pulled the code using a MAC tools OBD scan tool. The code came up P1150, undefind code. I could not find this code in my Toyota service manual. This I found weird. I had my vehicle serviced and they said my CEL was due to an O2 sensor, Bank 2. These sensors usually last for100k don't they? I pulled the sensor out and inspected it as well as wiped it off and re-installed it. Same problem. Toyota parts told me they have never ordered one in which leads me to believe that this is not the problem. Not to mention the cost of the sensor being $240. I don't want to r&r this to find out that the sensor is not the problem. The vehicle is running very rich as I can smell the fuel in the interior Is the maf sensor the problem? I am going to see if I knocked a vacuum hose off but I doubt it. What else should I look for? Thanks