BMW X5: Ignition Wires, Spark
REPLACING ALL SPARK PLUGS (N42, N40, N46, N45, N52, N52K, N51)
Special tools required:
Necessary preliminary tasks:
- Switch off ignition
- Remove ignition coils.
Unscrew spark plugs with special tool 12 1 171.
Installation:
Tighten down spark plugs with special tool 12 1 171and special tool 12 1 200
(torque limiter).
Without special tool 12 1 200, observe tightening torque.
Tightening torque 12 12 1AZ0.

Fig. 1: Identifying Special Tool (12 1 171) And (12 1 172)
READ NEXT:
NOTES ON CHECKING IGNITION SYSTEM
Troubleshooting -> Fault in fuel injection system
-> Spark plug faults
-> Ignition coil faults
-> Further fault patterns with evaluation
-> Additional
IMPORTANT: Read and comply with notes on protection against
electrostatic damage (ESD
protection).
IMPORTANT: Aluminum-magnesium materials.
No steel screws/bolts may be used due to the threat of ele
SEE MORE:
IMPORTANT: Read and comply with notes on protection against
electrostatic damage (ESD
protection).
NOTE: Comply with notes and instructions on handling optical
waveguides.
Necessary preliminary tasks:
Disconnect battery negative lead.
Remove middle trim for instrument panel.
Release screws (1
Pull lever forward to remove:
If necessary, lever out lower locking point (1) from rear with a
screwdriver.
Release screw (2).
If necessary, move seat fully forwards and upwards.
Fig. 4: Releasing Screw And Locking Point
Remove trim:
Unclip at top edge
Unclip at rear towards top side
Pull