BMW 5251 Service Manual page 365

Ignition System
Remove intake manifold as described in 113 Cylinder Head
Remaval
and Installation.
Remove knock sensor mounting bolts (arrows) on side of
cylinder block. Remove sensors.
I
CAUTION-
I
Note the installedangle of the knock sensors on the bloclt be-
fore removalit. Reinstall the sensors in the same position. Be
sure to use
a
torque wrench when tightening the sensor
mounting bolts.
Clean lknoclc sensor contact surfaces on engine bloclc and
sensors before installing.
Tightening torque
Knock sensor to engine bloclc
20 Nm (15
ft-lb)
-
Use scan tool to read out and clear ECM fault memory.
-
Installation is reverse of removal.