Check spark plugs and replace if necessary - AP15.00-P-1550Z

ENGINE 103, 104, 111, 119 with CODE (491) USA version 

ENGINE 120 as of 1.10.93 with CODE (491) USA version 

Fig 1: Identifying Spark Plugs - Shown On Engine 120 With ME 1.0

Fig 2: Identifying Spark Plugs - Shown On Engine 104 With LH-SFI

1	Blow out spark plug pockets in cylinder head
	Checking
2.1	Check spark plug connectors, ignition coil connectors and ignition lines for damage, deformation and crack formation	Only for engine 111 Replace, if necessary.
3	Check spark plugs for deposits	Visual inspection If there are deposits on the electrodes ↓
		Replace spark plugs Engine 103, 104, 111, 120	AP15.10-P-1580CA
		Engine 119.97/981/ 982/985	AP15.10-P-1580EA
4	Check electrode gap and adjust if necessary		*BE15.10-P-1001-01A