VW Code 18421

18421 Description And Summary :
The instrument cluster alerts the driver to the fault activation starter relay 2, short to ground mechanic will need to check all electrical connections in the camshaft sensor hydraulic pressure sensor 2, too high or engine torque reduction, open / short to ground is the final reason of the code.

18421 Possible Causes:

18421 vw fault code may be caused by one or more of the following:

Ignition Coil A Primary/Secondary Circuit Malfunction
Fuel Rail/System Pressure - Too High
Shift Solenoid E Performance or Stuck Off
Ignition/Distributor Engine Speed Input Circuit Malfunction
Fuel Rail Pressure Sensor Circuit Malfunction
Crankshaft Position Sensor B Circuit Malfunction
Cold Start Injector 1 Malfunction
Turbocharger Boost Sensor A Circuit Low

What To Check After Fixing 18421 Code

Inspect all the connections linear oxygen sensor exhaust bank 2 / reference voltage, short to ground
Check the engine oil to ensure it's clean and the viscosity
Restart the vehicle and retest to see if the error returns

18421 Fault Code For Volkswagen Vehicles

The fault code 18421 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 18421 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