In the last month my car's developed a problem when cruising on a light throttle @ 70-80 ...
Under normal circumstances (hard & gentle driving) it's great but intermittently when cruising, if I want to accelerate or maintain speed up a hill, I get literally no increase in speed or revs until I lift off the accelerator. I then have to progressively feed the power in to speed up.
I've got no dash lights or loss of mpg. However, I did have it scanned and have a VCDS code:
P0299-006 - "control range not reached" - Intermittent
I've read multiple forum posts that point at:
- Faulty Pressure Converter Valve / Boost Control Solenoid (N75 valve?)
- Perforated diaphragm in the Vacuum (VNT) Actuator ?
- Faulty Intake Manifold Flap Actuator
- Perished/split inlet manifold gasket
Anyone offer any advice on which is the most likely to be causing this fault?
Thanks.