Action in service

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

• Oxygen sensor before catalytic converter
• Hot-film air mass meter
• Intake pipe pressure sensor
• Intake air temperature sensor

• Electromotive throttle actuator
• Fuel tank vent valve
• Camshaft sensor
• High-pressure fuel system
• Low pressure fuel system
• Ethanol sensor (only in E100 vehicles)

Check air intake system for tightness, checking the following components as well at the same time:

• Crankcase ventilation
• Oil filler cap
• Oil dipstick
• Tank ventilation system
• Brake servo
• Cylinder head cover

Check exhaust system for leak tightness.

Rule out poor fuel grade.

Replace injectors and then delete adaptations.