| Readout on -V.A.G 1552 - | Possible cause of fault | Rectifying fault |
| low learned values | | t
| low learned values in idling at normal lambda partial load learned values: Oil dilution (higher fuel content in the oil) possible |
| | –
| Disappears after driving on motorway or changing oil |
|
| | | | –
| Testing injection valves |
|
| | | | –
| Test fuel pressure regulator and system pressure → Chapter |
|
| | | t
| Solenoid valve for activated charcoal filter constantly open |
| | –
| Testing solenoid valve for activated charcoal filter → Chapter |
|
| | | t
| Lambda probe heating defective or lambda probe dirty |
| | –
| Check lambda probe heater |
|
high learned values
| | t
| high learned values in idling at less high lambda learned values in partial load: Unmetered air in intake manifold region possible |
| |
| | | |
| | | | –
| Test fuel pressure regulator and system pressure → Chapter |
|
| | | t
| Unmetered air at the manifold gasket |
| |
| | | t
| Lambda probe heating defective or lambda probe dirty |
| | –
| Check lambda probe heater |
|
