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LSU sensor without resistor like Haltech and Daytona Sensor why?

EFI Wiring Fundamentals

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Hi, on Haltech and Daytona sensor wideband, they change the LSU sensor connector for Deutsch DT.

When I check the wiring the resistor don't seem to be use. Why?

https://i.ebayimg.com/images/g/8yMAAOSwBzpblqJ1/s-l640.jpg

thanks a all infos

Because they use free-air calibration instead of the built-in calibration resistor. Easier and cheaper for them. Not as convenient for you.