Action in service

If faults are entered for the following components, these must be processed first:

• Intake system, Valvetronic, VANOS, exhaust turbocharger, pressure sensors.

Check air intake system for leaks.

Check crankcase ventilation connection to cylinder head cover.

Check tank ventilation connection to second inlet point.

Check hot film air mass meter for oil pollution.

Replace hot-film air mass meter.