Oxygen Sensor Tester and Simulator

Canadian flag with caption saying: Made in Canada

  The ST05 Oxygen Sensor Tester and Simulator is an easy-to-use tool for testing and diagnosing problems with any oxygen sensor (also known as lambda sensors). This tool can help you quickly determine whether the sensor is defective and needs replacement. The ST05 is compatible with all types of oxygen sensors: Zirconia, Titania 1 volt, Titania 5 volt, wide band "dual-cell", and heated or unheated (1, 2, 3, 4 or 5 wires).

  The ST05 is designed as a stand-alone tool which can also complement scan tools in the diagnostic process. The tool provides the means for fast and accurate testing, showing the sensor's output signal in real time in a bar graph, which allows to diagnose "lazy" sensors which may not trigger DTC's but cause drivability problems. It also display cross counts on an alphanumeric display, and can simulate rich and lean conditions. Sensors can be tested ON or OFF vehicle, and the ST05 does not require time-consuming setups or in-depth knowledge.


General Technologies Corp. ST05 Oxygen Sensor Tester/Simulator

Simple and flexible to use

Technical Specifications


  • Test zirconium sensors
  • Test titanium 1 Volt sensors
  • Test titanium 5 Volt sensors
  • Test 1 to 4 wires sensors (heated and unheated)
  • Simulate rich and lean sensor output
  • Test sensor response time


  • ST05
  • Two piercing clips with 6 ft. cables
  • Protective rubber holster
  • Polypropylene carrying case
  • 1 x 9 Volt alkaline battery
  • User's Manual