Denso Primary O2 Sensor for 12-15 Civic Si

Primary O2 Sensor Factory Replacement Fits 12-15 Civic Si/13-15 ILX Description Vehicle Fitment The Denso O2 Sensor for the 12-15 Civic Si is a great alternative to the factory unit. Designed as a replacement for the OE Part Number 36531-RX0-A01, 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.    2013-2015 Acura ILX 2012-2015 Honda Civic Si 2012-2014 Honda CR-V 2012-2015 Honda Crosstour