Twin Tec IIID WEGO Wide-Band Exhaust Gas Oxygen Sensor Interface Installation Instructions

The Twin Tec WEGO IIID is a wide-band exhaust gas oxygen sensor interface that allows you to log front and rear cylinder air/fuel ratio (AFR) data for engine tuning. It works with the Twin Scan II or Twin Scan 3 and uses low-cost Bosch LSU 4.2 5-wire wide-band oxygen sensors. The WEGO IIID is fully sealed for moisture protection and includes internal diagnostics for abnormal battery voltage, sensor open circuit, and sensor short circuit conditions. It is not for use with racing gasoline containing lead and may give inaccurate results in certain situations, such as with open drag pipes, mufflers without restrictive baffles, or excessive exhaust back pressure. This device is typically installed on motorcycles, but it can be installed on vehicles operated on a chassis dyno with proper grounding.

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Twin Tec WEGO IIID Installation Instructions | Manualzz

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Key features

  • Logs front & rear cylinder AFR data
  • Uses Bosch LSU 4.2 5-wire wide-band oxygen sensors
  • Fully sealed for moisture protection
  • Includes internal diagnostics
  • Compatible with Twin Scan II or Twin Scan 3

Frequently asked questions

The WEGO IIID logs front and rear cylinder air/fuel ratio (AFR) data for engine tuning.

It uses Bosch LSU 4.2 5-wire wide-band oxygen sensors.

The practical operating range for most engines using gasoline fuel is from approximately 11.5 to 14.7 AFR.

It may give inaccurate results in certain situations, such as with open drag pipes, mufflers without restrictive baffles, or excessive exhaust back pressure.

It includes internal diagnostics for abnormal battery voltage, sensor open circuit, and sensor short circuit conditions.
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