1997 Honda Accord Cannot detect speed sensor

Just to add a note. When I detached/reattached the speed sensor nothing changed.

The Vehicle Speed Sensor (VSS) produces a pulsing voltage whenever vehicle speed is over 3 mph. The data is transmitted to the PCM which uses it for speedometer operation. You should remove the electrical connector from the VSS and check for circuit continuity (on the harness side). The circuit should have battery voltage available. If no voltage is available then check for an open circuit between the VSS and the drivers side fuse box. Check the fuse. If everything is ok here then the problem is likely to be with the VSS itself. To check this, place the electical connector back on the VSS and raise the front wheels off the ground (use stands). Turn the ignition ON (leave engine off) and back probe the VSS connector with an ohmmeter. (Positive terminal to the blue/white lead and negative to the black lead.) Securely block or hold one of the front wheels and the spin then other by hand. The ohmmeter should pulse between 0 and 5 volts. If it doesn't, replace the sensor.

A Dave H explained replacement is as simple as pulling out the old sensor and putting in the new one but do make sure you use a new o-ring. Hope this helps. :)