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Availability: 1 in stock

URD O2 Sensor Calibrator



Availability: 1 in stock

The URD O2 Sensor Calibrator will allow enrichment of the fuel mixture while the engine’s ECU is operating in closed-loop mode.  It is ideal for stock engines that have been converted to forced induction.

Please download the URD U-Tune Guide for an explanation of closed-loop operation.

When the ECU is operating in the closed-loop mode it is using feedback from the O2 sensor in the exhaust and makes adjustments to keep the fuel mixture at 14.7:1 AFR.   This may prove to lean for most engines while operating in boost from a supercharger or turbo system.

The URD O2 Sensor Calibrator is ideal for that small envelope where you are boosting your engine and the ECU is still in closed-loop mode and is fighting to keep the fuel mixture at a lean 14.7:1 AFR.  This calibrator intercepts the signal from the O2 sensor and adjusts its signal so you can tune in some boost enrichment.  It is programmed using the R4 tuning software (included) and it will allow you to alter the voltage signal from the O2 sensor based on manifold pressure and engine RPM.  The URD O2 Sensor Calibrator will be shipped with a map table preloaded that was developed on a 5VZ-FE engine and it works very well with supercharged and turbo applications.

The calibrator has a built-in high precision Manifold Absolute Pressure Sensor (MAP).   This device is voltage based and is very different in operation from the ESC1that we have been offering for years.  The ESC1 device is frequency-based.  In our testing, we have found that this new programmable voltage based system is more consistent with the later O2 sensor vehicles and does not have any unwanted side effects.

This device is not compatible with Toyota vehicles that use the newer type Air/Fuel Ratio Sensor(s) (wideband).  For that application please use the URD AFR Sensor Calibrator. This is a single channel unit and will only calibrate the signal from one 02 sensor.  A dual-channel unit for dual bank systems is in development.


Year Make Model Engine
Year Make Model Engine
1990 - 1993 Toyota Celica I4 1.6 4A-FE
1990 - 1993 Toyota Celica I4 2.0 3S-GTE
1990 - 1999 Toyota Celica I4 2.2 5S-FE
1991 - 1992 Toyota MR2 3S-GTE
1993 Toyota T-100 V6 3.0 3VZ-E
1994 Toyota T-100 I4 2.7 3RZ-FE
1994 - 1999 Toyota Celica I4 1.8 7A-FE
1994 - 1999 Toyota RAV4 I4 2.0 3S-FE
1995 - 1997 Toyota Avalon V6 3.0 1MZ-FE
1995 - 1997 Toyota Corolla I4 1.8 7A-FE
1995 - 1998 Toyota T-100 I4 2.7 L 3RZ-FE
1995 - 1998 Toyota T-100 V6 3.4L 5VZ-FE
1995 - 2000 Toyota Tacoma I4 2.4L 2RZ-FE
1995 - 2000 Toyota Tacoma I4 2.7L 3RZ-FE
1995 - 2000 Toyota Tacoma V6 3.4L 5VZ-FE
1996 - 2000 Toyota 4Runner I4 2.7L 3RZ-FE
1996 - 2000 Toyota 4Runner V6 3.4L 5VZ-FE
1997 - 1999 Toyota Camry I4 2.2 5S-FE
1997 - 1999 Toyota Camry V6 3.0 1MZ-FE
1998 - 2001 Toyota Corolla I4 1.8 1ZZ-FE
1999 Toyota Avalon V6 3.0 1MZ-FE
1999 - 2000 Toyota Solara I4 2.2 5S-FE
1999 - 2000 Toyota Solara V6 3.0 1MZ-FE
2000 Toyota Tundra V6 3.4L 5VZ-FE
2003 - 2004 Toyota Matrix I4 1.8 1ZZ-FE
2003 - 2004 Toyota Matrix I4 1.8 2ZZ-GE
Weight 2.00 lbs
Dimensions 7 × 6 × 3 in


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