2006 Civic SI O2 upstream sensor location - Honda-Tech - Honda Forum Discussion
Automotive-leader 234-9126 4-Wire Upstream Air Fuel Ratio Oxygen O2 Sensor for 2006 Honda Civic DX/EX/LX Coupe 1.8L-l4; for 2006 Honda Civic DX/EX/EXS/LX/LXS Sedan 4-Door 1.8L-l4 36531-RNA-A01 : Amazon.ca: Automotive