From Ross-Tech Wiki
19559/P3103 - Motor for Intake Manifold Flap (V157), Malfunction
- Higher fuel consumption
- Insufficient acceleration above 100-120 kmh
- Shutting off the engine is not nice and easy
- Intake Manifold Flap (V157) or the motor for V157 doesn't work well.
- Check wiring and connections
- Check / Replace V157, but probably you have to replace the whole EGR
- The Intake Manifold Flap (V157) has a function in the EGR and in shutting off the (diesel) engine.