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VAG Error Code: 16486
EOBD II Error Code: P0102

Fault Location:
Mass Air Flow (MAF) Sensor (G70), Bank 1 - Low Input

Possible Cause:
Malfunction Indicator Lamp (MIL)(K83) active.
Engine stall.
Engine running rough.
Excessive fuel consumption.
Excessive smoke.

Intake leak.
Air filter blocked.
Wiring short to earth.
Fuse(s).
Mass air flow (MAF) sensor (G70).
Mass Air Flow (MAF) (G70) defective.
Dirty Mass Air Flow (MAF) Sensor (G70) air filter.

Possible Solutions:
Check wiring and connections.
Check / Replace Mass Air Flow (MAF) (G70).
Mass Air Flow (MAF) sensor signal < 66 µs

Special Notes:
In MY 1995-2002 (?) in Europe at VW-diesel-cars G70 had the bad reputation of slowly losing his performance, causing loss of power. It's not a matter of defective or breaking down, but it is filthy / dirty (not easy to clean). You can check functionality by making a log in [01-engine], [meas.blocks-08], group 003 (3e gear, full throttle, from 1700-4000rpm).

Tech Notes:
Before replacing the mass air flow sensor, try replacing the air filter and cleaning the air flow sensor with low compress air or mass air flow sensor cleaner. Reset code and drive vehicle. If the code comes back, it may be necessary to replaced the mass air flow sensor.

When is the code detected?:
An excessively low voltage from the sensor is sent to Engine Control Module (ECM).

Description:
The Mass Air Flow (MAF) sensor is placed in the stream of intake air. It measures the intake flow rate by measuring a part of the entire intake flow. It consists of a hot film that is supplied with electric current from the Engine Control Module (ECM).

The temperature of the hot film is controlled by the Engine Control Module (ECM) a certain amount. The heat generated by the hot film is reduced as the intake air flows around it. The more air, the greater the heat loss. Therefore, the Engine Control Module (ECM) must supply more electric current to maintain the temperature of the hot film as air flow increases. The Engine Control Module (ECM) detects the air flow by means of this current change.

I've never heard of P01200 is that a typo?

VAG Error Code: 16504

EOBD II Error Code: P0120

Fault Location:

Throttle Position Sensor (TPS) (G127)/Switch A/Accelerator Pedal Position (APP) Sensor/Switch (G69) A - Circuit Malfunction

Possible Cause:

Malfunction Indicator Lamp (MIL)(K83) active.

Wiring.

Throttle position sensor (TPS) (G127)/switch (G97).
Accelerator pedal position (APP) sensor/switch.
Engine Control Module (ECM).

When is the code detected?:

Malfunction is detected when an excessively low or high voltage from the sensor is sent to Engine Control Module (ECM).

Description:

The Throttle Position Sensor (TPS) (G127) responds to the accelerator pedal movement. This sensor is a kind of potentiometer which transforms the throttle position into output voltage, and emits the voltage signal to the Engine Control Module (ECM). In addition, the sensor detects the opening and closing speed of the throttle valve and feeds the voltage signal to the Engine Control Module (ECM).

Idle position of the throttle valve is determined by the Engine Control Module (ECM) receiving the signal from the throttle position sensor. This sensor controls engine operation such as fuel cut. On the other hand, the Wide open and closed throttle position switch, which is built into the throttle position sensor unit, is not used for engine control.

As taken from my https://volkswagenforum.com/forum/ge...oftware-34973/