Does anyone else use this site? I recently had the P0012 and P0022 codes on my '11 FX4, after a quote from my dealership I decided to do it myself. The first issue was I could not even find the sensors on the exhaust side, they are tucked on the backside of the engine between the firewall. The website not only showed me where they were located, all four of them, but how to change them step by step. I do have the Haynes manual to the truck but it is pretty basic with directions and the pictures are not that great. Now that I know exactly how to change them I will be attempting in the near future, but it does come with a price. about 30 dollars for a year subscription, but well worth it in the long run if you can save the time and hassle of dealing with the dealership.