Compatibility: 02 sensor compatible with Honda for Element 2003-2011, for Civic 1999-2000; compatible with Acura for EL 1999-2000
Bank 1 Sensor 1=Upstream(Right/Rear); Bank 2 Sensor 1=Upstream(Left/Front); Bank 1 Sensor 2=Downstream(Right/Rear); Bank 2 Sensor 2=Downstream(Left/Front). Please check the plug and the length of the sensor carefully