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This is the latest Prosport 0258007206 five wire LSU 4.2 wideband O2 sensor, this high performance Prosport LSU 4.2 wideband sensor has a very accurate AFR measurement and is used widely in the automotive tuning industry. This sensor is a direct replacement sensor for all ECU's or cars or AFR gauge kits that use the Bosch 0258007206 sensor as standard.