| Display field | Readout on -V.A.G 1552 - | Fault cause | Rectifying fault |
| 3 | less than 2.0 | | t
| high fuel volume from the activated charcoal filter system |
| | –
| Test solenoid valve for activated charcoal filter → Chapter 01-1, final control diagnosis |
|
| t
| incorrect injection valve with too great flow rate fitted |
| |
| above 4,0 | | t
| Increased engine load due to electric consumers, air conditioning system, engaged driving position or power steering to the stop |
| |
| 4 | less than 2.0 | | t
| Large quantity of unmetered air between intake manifold and air mass meter |
| | –
| Eliminate unmetered air |
|
| above 4.5 | | t
| Engine loaded by auxiliary equipment |
| | –
| Eliminate load (air conditioning, power steering etc.) |
|
| |
