I think ebcause your getting ripped off... Goto autozone. I just checked for a 99 gs for the second o2 sensor after the cat it's 80 bucks
BOSCH
O.E. TYPE 13417 1 YR $79.99 Normally Stocked at Your Selected Store Add to Store List Ships within 2 Business Days Buy Online
O2 SENSOR for a
1999 MITSUBISHI ECLIPSE
SENSOR LOCATED AFTER CATALYTIC CONVERTER
Enjoy and always check autozone before the stealership. It may not be a genuine part but it does the same thing
