Have a 98 civic lx with automatic. The CEL is showing four codes: 17-vss speed sensor, 20-electrical load detector, 41-primary oxygen sensor heater and 65-secondary oxygen sensor heater wire. Just replaced the alternater which took care of some other problems but when I hooked the battery back up on the car, the CEL tripped these four codes (17,20,41,65) The only symptoms showing with the car now is the speedometer does not work.

 

You should check the fuses. VSS Sensor and the O2 Heater share the same fuse.

I'm not sure if i have the right wireing schmatic here, but check the Fuse 15 in the under dash fuse box.

 

Dude you are the best, it was a blown fuse. Thanks for the suggestion.