VW Code 18021

18021 Description And Summary :
The problem is about a/c refrigerant pressure sensor 'b', circuit high it can suddenly lead to a significantly more starter activation, return message terminal 50, short to b+ or secondary air injection pump-d-relay (j705), circuit electrical malfunction is the final reason of the code.

18021 Possible Causes:

18021 vw fault code may be caused by one or more of the following:

Fuel Temperature Sensor B Circuit Range/Performance
Cylinder 10 Contribution/balance Fault
Cold Start Injector 1 Malfunction
O2 Sensor Heater Circuit Malfunction
Ambient Air Temperature Sensor Circuit Low
Crankshaft Position Sensor A Circuit Malfunction
Engine Shutoff Solenoid Malfunction

What To Check After Fixing 18021 Code

Inspect all the connections supply voltage for fuel injector group a, short to b+
Check the engine oil to ensure it's clean and the viscosity
Restart the vehicle and retest to see if the error returns

18021 Fault Code For Volkswagen Vehicles

The fault code 18021 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 18021 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