ST05 Oxygen Sensor Tester Simulator

  • Availability: In Stock

ST05 Features

  • The sensor signal output is shown in real time on the bar graph, while a 2 digit alphanumeric display shows the sensor output cross count per second.

  • By pressing the ‘Test’ button and performing a snap throttle acceleration of the engine, it tests the response time of the sensor and shows a pass or fail result within seconds.

  • Two buttons allows for simulation of rich or lean conditions to monitor response of the engine control module.

  • Advanced connection detection: The ST05 automatically detects common wire misconnections like ground, heater wires, disconnected test leads, reversed polarity etc. and displays these on the alphanumeric display.

  • It only requires the connection of two probe clips to the oxygen sensor wires, and the selection of the oxygen sensor type.

Simple and flexible to use

  • Sensor can be tested on or off the vehicle

  • Does not require special setups or in depth knowledge to use

  • Provides instant readings and testing capabilities of the output of the sensor

  • Diagnoses “lazy” (slow response) sensors, which may not set DTCs, but cause drivability problems

  • Excellent preventive maintenance tool, to diagnose sensors that need to be replaced before they set DTCs or completely fail

  • Ruggerized electronics make it almost impossible to damage the instrument, even if wrongly connected

  • No software to upgrade.

Technical Specifications

  • Display:

    • 2 digits LED alphanumeric display

    • 20 segments LED bargraph  with 0 to 1 Volt or 0 to 5 Volt ranges

  • Cross Count:  0.1 to 10 CPS

  • Response test: <100 ms Pass +/- 5 ms,  >100 ms Fail +/- 5 ms

  • Test leads: 2 wire piercing alligator clips, and 6.5 ft cables

  • Power Source: One standard 9 Volt alkaline battery type NEDA 1604 IEC 6F 22

  • Battery life: Approx. 25 hrs, with low battery indicator and auto power

  • Physical dimensions (including holster):  6" (H) x 4" (W)x 1.5" (D) (158 x 100 X 37 mm)

  • Weight: Approximately 14 Oz. or 406 gr. (including battery)

Electrical Specifications

  • Input Range:  0 to 5 Volt

  • Input Protection: +/- 48 VDC Max, current limited

  • Auto Detection:  Detects reversed polarity, ground, heater and open connection


  • 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 Includes:

  • ST05

  • Two piercing clips with 6 ft. cables

  • Protective rubber holster

  • Polypropylene carrying case

  • 1 x 9 Volt alkaline battery

  • User’s Manual