Denso Primary O2 Sensor (06-11 Civic Si)

Replacement O2 Sensor Designed for the Primary Location Fits 06-11 Civic Si Description Vehicle Fitment Technical Data The Denso O2 Sensor for the 06-11 Civic Si is a great alternative to the factory unit. Designed as a replacement for the OE Part Number 36531-RRA-013, this primary O2 sensor will work with most aftermarket headers and factory exhaust systems. Please note you may need to run a defouler in order for the O2 sensor to read correctly when used with an aftermarket header.  2006-2011 Honda Civic Si Replaces Factory Part #: 36531-RRA-013