Sorry I don't have a manual for '98 models mate. But when changing camshaft
sensors, the battery negative terminal should be disconnected. Try to trace
the wiring back fro the sensor and locate the wiring connector attached to
the bracket behind the oil filter. Remove the screw or release the clips
securing the wiring ducting to the front of the engine then release the
sensor wiring from the ducting. Unscrew the sensor securing bolt and
withdraw the sensor. Recover the O-ring if it is loose. Refitting is the
reversal of removal.