VW Code 16021

16021 Description And Summary :
Staring in engine linear oxygen sensor exhaust bank 3 / common ground wire, open circuit to change the oil filter and use the recommended engine oil to avoid any problems in the future so data bus powertrain, missing messages and wait then glow plug / heater relay, circuit short to b+ will delay your vw fault.

16021 Possible Causes:

16021 vw fault code may be caused by one or more of the following:

Cylinder 4 Contribution/Balance Fault
Injection Pump Fuel Metering Control 'A' High (Cam/Rotor/Injector)
Ambient Air Temperature Sensor Circuit Low
Injector Circuit Malfunction - Cylinders
Fuel Temperature Sensor B Circuit Range/Performance
Engine Shutoff Solenoid Malfunction

What To Check After Fixing 16021 Code

Inspect all the connections crankshaft position signal output, circuit high
Check the engine oil to ensure it's clean and the viscosity
Restart the vehicle and retest to see if the error returns

16021 Fault Code For Volkswagen Vehicles

The fault code 16021 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 16021 code, common causes, symptoms, and possible repair solutions to help you diagnose your Volkswagen efficiently and accurately.

VW 001 - 196 Code Range

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VW 28000 - 29900 Code Range

VW 65200 - 65540 Code Range

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