o2 sensor PO135 (O2 Sensor Heater circuit malfunction Bank 1 Sensor 1)
http://www.tundrasolutions.com/forums/engine-and-drivetrain/147864-tundra-o2-sensor-1-replacement/
amazon tool to remove O2 sensor
http://www.amazon.com/OEM-27110-Oxygen-Sensor-Socket/dp/B00062ZK5M/ref=sr_1_1?ie=UTF8&s=automotive&qid=1253984443&sr=8-1