From Ross-Tech Wiki
18438/P2006/008198 - Intake Manifold Runner Control Stuck Closed, Bank 1
- Malfunction Indicator Light (MIL) ON
- Reduction of power at higher RPMs
- Vacuum leak
- Faulty Intake Manifold Runner Position Sensor1 (G336)
- Intake Manifold Runner binding or sticking
- Replace failed vacuum line
- Check Intake Manifold Runner Position Sensor 1 (G336) and wiring, see repair manual.
- When found in 2005 - 2008 Audi A4 and A6 with 3.2L FSI engines, please see TSB 2019485/1.