Please check fitment notes & description for accurate information. 1999 Toyota 4Runner 2.7L 2000 Toyota 4Runner 3.4L 2000 Toyota Tacoma 3.4L 2000 Toyota Tundra 3.4L Oxygen Sensor's Location: How do I know the O2 sensor is good or not? Check engine light on A reduction in fuel economy. Your catalytic converter fails unexpectedly Exhaust emissions reach undesirable levels. How to install the oxygen sensor? .
