FAST XFI wideband auxiliary air/fuel ratio modules include a wideband oxygen sensor and an O2 sensor processing unit that plugs directly into your FAST XFI harness. Making it easy to use was a priority for FAST, so these sensor kits utilize fully automatic sensor calibration. No need to manually "free-air" calibrate the sensor; just turn the power on, and in just seconds these FAST units output an accurate and consistent air/fuel signal. Additionally, each sensor kit is a standalone unit—so using multiple kits for measuring all your engine's cylinders is a breeze. With industry-leading plug-and-play installation, accuracy, and ease of use, it's clear that FAST XFI wideband auxiliary air/fuel ratio modules are the best choice for serious engine tuners.

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