$20 for 1-2 wires, $30 for 3-4 wires. I know that's cheap. maybe others have seen prices like these, but I have not. Still, I went with the DENSO for $52...but still very cheap. Fron sensor on the CRV has never been right since I did an intake cleaning. Replacement one did not do the trick as far as the ligt goes. MPG is ok, but it tanked at 16mpg at one point. iirc, the rear is a BOSCH and gives no codes, but I still shy away from BOSCH rinky-dinky parts. Some are good, not chain store BOSCH though.
http://www.car-stuff.com/store/?N=10608+4294967268+1631+11921+9167
http://www.car-stuff.com/store/?N=10608+4294967268+1631+11921+9167