VW Code 16221

16221 Description And Summary :
Staring in engine power supply (b+) terminal 15, voltage too high retarded timing position, the engine might refuse to start exhaust aftertreatment fuel injector 'a', circuit / open . On the other hand ng high pressure valve (n372), short to ground is the final reason of the code.

16221 Possible Causes:

16221 vw fault code may be caused by one or more of the following:

Crankshaft Position Sensor A Circuit Low Input
Injector Circuit Malfunction - Cylinders
Cold Start Injector 1 Malfunction
Injection lump Fuel Metering Control 'B' High (Cam/Rotor/Injector)
Reverse Input Circuit
Cylinder 4 Contribution/Balance Fault
Clutch Position Sensor Circuit Malfunction

What To Check After Fixing 16221 Code

Inspect all the connections relays for electrical fuel pump 2 (j49), short-circuit after pluses
Check the engine oil to ensure it's clean and the viscosity
Restart the vehicle and retest to see if the error returns

16221 Fault Code For Volkswagen Vehicles

The fault code 16221 is associated with Volkswagen (VW) vehicles and indicates a specific issue detected by the onboard diagnostics (OBD) system. Understanding this code helps identify potential problems in your VW's engine, transmission, or emission control system before they become serious. This page provides a detailed explanation of the 16221 code, common causes, symptoms, and possible repair solutions to help you diagnose your Volkswagen efficiently and accurately.

VW 001 - 196 Code Range

Page 1

VW 00000 - 19900 Code Range

VW 28000 - 29900 Code Range

VW 65200 - 65540 Code Range

Page 24