Location Of Sensors / Fault Codes

[ChrisScenic]

Hi,

I'm getting a few error codes on the 2004 Scenic 1.6 Auto:

P0105 - Powertrain:
Manifold Absolute Pressure / Barometric Pressure Circuit.

P0460 - Powertrain:
Fuel Level Sensor Circuit.

P0638 - Powertrain:

Throttle Actuator Control Range / Performance (Bank 1)

Any help as to the locations of these or ideas on how they can be resolved would be great.

Thanks.