Replace the spark plugs

Fig 1: Identifying Spark Plug

Courtesy of VOLVO CARS OF NORTH AMERICA.

Install new spark plugs: 

• Check the spark plug gap.
  NOTE:

  Turbocharged engines:

  Correct spark gap: 0.7 - 0.8 mm (0.02- 0.03 in).

• Lubricate the spark plug threads with paste.

  P/N: 116 1408.

  Tighten to 30 Nm (22 lb. ft)  .