Ignition System: Service and Repair

Ignition System Component Overview






1 Knock Sensor 1 (G61)

• On the front of the cylinder head under the intake manifold.

• Contacts are gold plated.

• For electrical connectors, refer to => [ Electrical Connectors ].

• Removing and installing, refer to => [ ] Service and Repair.

2 Bolt

• 22 Nm

• Tightening specification influences the function of the knock sensor.

3 Ignition Coil with Power Output Stage

• Ignition coil 1 with power output stage (N70).

• Ignition coil 2 with power output stage (N127).

• Ignition coil 3 with power output stage (N291).

• Ignition coil 4 with power output stage (N292).

• Removing and installing, refer to => [ Ignition Coil with Power Output Stage ] Service and Repair.

4 Spark Plug

• 25 Nm

• If the spark plug is replaced, lubricate the ignition coil with power output stage. Refer to => [ Installing, Ignition
Coils with Power Output Stages ] Service and Repair.

• Note the change intervals.

• Type and electrode gap, refer to => [ Spark Plug Technical Data ] [1][2]Spark Plug.

• Remove and install using the spark plug removal tool (3122 B).

5 O-ring

• No replacement part available.

• Replace if damaged.

6 Engine Speed Sensor (G28)

• On the front lower left side of the cylinder block, next to the oil separator. Refer to => [ Engine Speed Sensor ].

• Removing and installing, refer to => [ ] Service and Repair.

7 Bolt

• 9 Nm

8 Camshaft Position Sensor (G40)

• Bolted on the front of the cylinder head cover. Refer to => [ Camshaft Position (CMP) Sensor ].

• For electrical connectors, refer to => [ Electrical Connectors ].

Camshaft Position (CMP) Sensor





1. CMP sensor


Engine Speed Sensor





1. Engine speed sensor


Electrical Connectors





1. CMP sensor

2. Knock sensor 1

3. 8 pin harness connector for fuel injectors