O2 Simulator & Tester GM 4 Wire (1996-2003)
  The O2 simulator & tester is a plug-in replacement for the secondary O2 sensor that will provide the PCM with a signal that emulates a healthy cat for testing and off-road purposes. An extremely compact circuit board (.6 x .6 inches) is molded into the end of the connector to provide the most compact and water resistant simulator on the market. This circuit provides the signal to the PCM and also simulates an o2 heater load for the more advanced PCMs.
Installs in less than 10 minutes and does not require any tools. The O2 simulator is standalone and as such does not need to be located anywhere near the exhaust system. It is further recommended that the harness connecting to the o2 simulator be coiled up and cable tied (with included cable tie) away from the hot exhaust that could damage the casing of the simulator if it comes in contact with it. Some vehicles such as F-bodies with front dual exhaust have four oxygen sensors and require two simulators per vehicle.
For off-road/competition/testing use only. Not to be used on any vehicle driven on a public road. Vehicle owners are responsible for complying with all local emissions laws. Vehicle owners accept these terms and conditions by placing their order.
Applications: Most 1996-2003 GM OBDII passenger vehicles should be able to use this configuation. Please double check your o2 sensor and compare it to the chart below to identify the type you need. Types 5 & 8 are not in use yet.
Attention GM truck owners: If you have 2 sensors you must check both of them to confirm the type you need from our chart. The trucks vary a lot and we have even seen 2 different types on the same truck. On type 2 and 4 pay attention to whether your sensor has a plastic guide inside the tube on one side or both sides between the pins.
Problem Vehicles: We have issues with the 2000-2003 Sierra, Silverado, Suburban trucks using the type 2 or 4 simulator. Also, the 2003 Chevy S10 and 2002 Cavalier/Grand Am. The current version of the simulator does not work with these vehicles. Simulators do not work on Saturn vehicles. An updated version is in the works that we hope to have available soon.
LS1 F-Body (Camaro/Firebird) cars use two Type 1.
** Note, we will fix your shipping to $6.00 if you order more than one.
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 |  o2 Simulator Connector ChartYou want to match your o2 sensor end to one of the connector types on this chart. You will unplug the sensor from the wiring harness and plug the simulator into the wiring harness. If you no longer have your sensor, you want the simulator to be the opposite of your wiring harness. Types 1 and 3 are female connectors (have the holes for the pins), types 2 and 4 are male connectors (have metal pins down inside the tube). On types 2/4 pay attention to the plastic guide(s) inside the tube between the pins. Type 2 has a guide on one side, type 4 has guides on each side between the pins.
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