Review on High-Performance NTK 22500 Oxygen Sensor: Boost Your Engine's Efficiency by Vincent Lott

My 2009 Ford Flex 3.5L P0138, P0158, P2096 and P2098 Engine Codes and Warning Light Fixed! The car runs better and got rid of my bad exhaust smell. The front sensor was easy to swap. almost impossible to replace! A slight play in my O2 socket rounded off an old rusty hex. Found a regular socket that fitted snugly, sanded the tip of the toe to allow a full hex to engage, cut off the old O2 cable wire and a fully seated socket. Very little space for the O2 socket/sensor as it fits the frame! I had to use a ratchet with a pipe extension to disconnect it! A new one is easy to install, but not easy to get to the connector that is attached to the valve cover. Worth the effort! So far these are great O2 sensors! I even bought NTK trans sensors and they worked great too!