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VAG Error Code: 16826
EOBD II Error Code: P0442

Fault Location:
Evaporative Emission (EVAP) System - Small Leak Detected

Possible Cause:
Malfunction Indicator Lamp (MIL)(K83) active.
Possible a noticeable fuel odour caused by the release of fuel vapours.

Missing or loose fuel cap.
Incorrect fuel filler cap used.
Fuel filler cap remains open or fails to close.
Foreign matter caught in fuel filler cap.
Fuel tank leaking.
Evaporative Emission (EVAP) System leaking.
Evaporative Emission (EVAP) canister.
Evaporative Emission (EVAP) Purge Solenoid (N80).
Hose connection(s).
Intake leak.

Possible Solutions:
Check Evaporative Emission (EVAP) System Sealing.
Check Fuel Cap.

Tech Notes:
The P0442 code means that the control module has detected a small leak in the Evaporative Emission (EVAP). Loose fuel tank filler cap is the most common cause that triggers the P0442 code.

When is the code detected?:
Malfunction is detected when EVAP control system has a leak, EVAP control system does not operate properly.

Description:
The Engine Control Module (ECM) tests the Evaporative Emission (EVAP) system for the following conditions:

- Large and small leaks.
- Excess vacuum.
- Purge flow during non-commanded conditions.
- Fuel Level and Fuel Pressure sensor faults.
- EVAP Purge and Vent Valve faults.

The Engine Control Module (ECM) monitors the Fuel Tank Pressure sensor in order to determine the level of vacuum/pressure in the EVAP system. The ECM commands both the EVAP Purge Solenoid and the EVAP Vent Valve ON when the conditions are met in order to apply an engine vacuum to the EVAP system. The Engine Control Module (ECM) commands the EVAP Purge Solenoid OFF once the system has reached a predetermined level of vacuum. This test verifies if a vacuum can be achieved in the EVAP system. Failure to develop a vacuum may be caused by a large leak or a restriction.

VAG Error Code: 16806
EOBD II Error Code: P0422

Fault Location:
Main Catalytic Converter, Bank 1 - Efficiency Below Threshold/Upper Limit Exceeded

Possible Cause:
Malfunction Indicator Lamp (MIL)(K83) active.

Oxygen (Lambda) Sensor(s) defective.
Oxygen (Lambda) Sensor(s) Control defective.
Catalyst faulty.

Possible Solutions:
Read Measuring Value Blocks (MVB).
Check Oxygen Sensor(s).
Check Oxygen Sensor(s) Control.
Perform Oxygen Sensor(s) Aging Check.
Set Readiness.

Special Notes:
For 1.8T's experiencing this fault code, this thread may be useful: Aftermarket DP/Cat -DTC - Cat efficiency below threshold - Who has this DTC and with DP/Cat

Tech Notes:
As the code description implies the P0422 code means that the vehicle's control module has detected that the three-way catalytic converter is not working properly (is not as efficient as the factory is expecting). Replacing the Oxygen (O2) sensors may sometimes fix the code, but in most cases the catalytic convert needs to be replaced to fix the problem. If the P0422 code is combined with other codes, try fixing the other codes first.

When is the code detected?:
The P0422 code is set when the Engine Control Module (ECM) detects rear Heated Oxygen Sensor value difference becomes closer to value of front Heated Oxygen Sensor. The Engine Control Module (ECM) monitors when vehicle speed is 25-60 MPH, load is 22-45 percent and engine speed is 1000-3000 RPM.

Description:
The Engine Control Module (ECM) monitors the switching frequency ratio of heated oxygen sensors 1 (front O2 sensor) and heated oxygen sensors 2 (rear O2 sensor).

A three way catalyst converter (Manifold) with high oxygen storage capacity will indicate a low switching frequency of heated oxygen sensor 2. As oxygen storage capacity decreases, the heated oxygen sensor 2 switching frequency will increase.

When the frequency ratio of heated oxygen sensors 1 and 2 approaches a specified limit value, the three way catalyst malfunction is diagnosed.

VAG Error Code: 16725/000833
EOBD II Error Code: P0341

Fault Location:
Camshaft Position (CMP) Sensor (G40) - Implausible Signal - Intermittent

Possible Cause:
Malfunction Indicator Lamp (MIL)(K83) active.
Possible Lack/Loss of Power.
Engine may stall while driving.

Faulty starter motor.
Starting system circuit.
Dead (Weak) battery.
Wiring/Connector(s) from/to Camshaft Position (CMP) Sensor (G40) faulty.
Camshaft Position (CMP) Sensor (G40) faulty.
Timing misaligned.

Possible Solutions:
Check/Replace Wiring/Connector(s) from/to Camshaft Position (CMP) Sensor (G40).
Read Measuring Value Blocks (MVB).
Check Camshaft Position (CMP) Sensor (G40).
Check Timing.

Tech Notes:
Sometimes and in some models, low battery voltage or a weak starter can trigger a Camshaft Position Sensor code.

When is the code detected?:
The camshaft position sensor signal sent to the Engine Control Module (ECM) during the first few seconds of engine cranking is out of range.

Description:
The Camshaft Position (CMP) Sensor is an electronic device used in an engine to record the rate at which the camshaft is spinning. This information is used by the Engine Control Module (ECM) to control ignition and fuel injection. The camshaft position sensor senses the retraction of camshaft (intake) to identify a particular cylinder. The Camshaft Position (CMP) Sensor senses the piston position. The sensor system consists of a rotating part, typically a disc, as well as a static part, the actual sensor. When the engine is running, the high and low parts of the teeth cause the gap with the sensor to change. The changing gap causes the magnetic field near the sensor to change. The change in the magnetic field cause the voltage from the sensor to change. When the crankshaft position sensor (POS) system becomes inoperative, the camshaft position sensor provides various controls of engine parts instead, utilizing timing of cylinder identification signals.

When the engine is running, the high and low parts of the teeth cause the gap with the sensor to change. The changing gap causes the magnetic field near the sensor to change. The change in the magnetic field cause the voltage from the sensor to change.

When the Crankshaft Position (CKP) Sensor system becomes inoperative, the Camshaft Position (CMP) Sensor provides various controls of engine parts instead, utilizing timing of cylinder identification signals.

VAG Error Code: 16518
EOBD II Error Code: P0134

Fault Location:
Oxygen (Lambda) Sensor 1 (G39), Bank 1/Heated Oxygen Sensor 1, (G39) Bank 1 - No Activity Detected

Possible Cause:
Malfunction Indicator Lamp (MIL)(K83) active.
High fuel consumption.
Excessive smoke from exhaust.

Wiring/Connector(s).
Oxygen (Lambda) Sensor 1 (G39)/Heated Oxygen Sensor 1, (G39).

Possible Solutions:
Check/Replace all faulty Wiring/Connector(s).
Read Measuring Value Blocks (MVB).
Check/Replace Oxygen (Lambda) Sensor 1 (G39), Bank 1/Heated Oxygen Sensor 1 (G39), Bank 1.

Tech Notes:
Replacing the Front Heated Oxygen Sensor Bank 1 usually takes care of the problem.

When is the code detected?:
The voltage from the sensor is constantly approx. 0.3V.

Description:
The front Heated Oxygen (Lambda) Sensor 1 (G39), Bank 1 is placed into the exhaust manifold. It detects the amount of oxygen in the exhaust gas compared to the outside air. The Heated Oxygen (Lambda) Sensor 1 (G39), Bank 1 has a closed-end tube made of ceramic zirconia. The zirconia generates voltage from approximately 1V in richer conditions to 0V in leaner conditions. The heated oxygen sensor 1 signal is sent to the Engine Control Module (ECM). The Engine Control Module (ECM) adjusts the injection pulse duration to achieve the ideal air-fuel ratio. The ideal air-fuel ratio occurs near the radical change from 1V to 0V.

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