URD Rear O2 Simulator, 2RZ-FE 2.4L , 3RZ-FE 2.7L



This URD Rear O2 Sim has been redesigned.  It is now a full Plug-N-Play design and takes under a minute to install.

Many people using their Toyota trucks in sanctioned off-road racing or rally events install an aftermarket high flow catalytic converter for added performance. Some of these aftermarket high flow units seem to flow like there is no catalytic converter at all.These high flow cats or (off road) lack of a cat may cause that annoying check engine light to activate.

Our rear O2 sensor simulator is a device that conditions the signal from the rear O2 sensor and keeps that signal in the proper range the ECU is expecting to see from a properly functioning and healthy catalytic converter. Our device takes a slightly different approach than most of the other devices on the market. It is designed to work with the O2 sensor that is installed down stream of the catalytic converter. It does not replace it. The rear O2 sensor must remain in contact with the exhaust stream. This way the vehicle will looks stock.If you do a diagnostic hook up, you will see a proper signal from the rear O2 sensor.

This device may not be legal for use on pollution-controlled vehicles operated on public roads and is intended for off-road use only.


Single Channel units- Locate the rear O2 sensor.  This will be to the rear of the catalytic converter.  Follow the wire from that sensor until you locate the harness connector.  On some vehicles this will go up through the floor of the vehicle.  Unplug the connector and plug one plug from the unit into the O2 sensor and the other to the harness connector and tie the unit to the harness away from the exhaust.

Year Make Model Engine
Year Make Model Engine
1996 - 2002 Toyota 4Runner I4 2.7L 3RZ-FE
1995 - 2004 Toyota Tacoma I4 2.7L 3RZ-FE
1995 - 2004 Toyota Tacoma I4 2.4L 2RZ-FE
1995 - 1998 Toyota T-100 I4 2.7 L 3RZ-FE
1994 Toyota T-100 I4 2.7 3RZ-FE

Additional information

Weight 1.00 lbs
Dimensions 8.00 × 2.00 × 5.00 in

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1 review for URD Rear O2 Simulator, 2RZ-FE 2.4L , 3RZ-FE 2.7L

  1. M Glickman

    Thanks…the parts worked great!