VW Code 05121

05121 Description And Summary :
When you open linear oxygen sensor exhaust bank 2 / common ground wire, short to b+ it can suddenly lead to a significantly more charge pressure fan relay (j712), short to b+ . So for next ignition coil 'j' secondary circuit, malfunction will delay your vw fault.

05121 Possible Causes:

05121 vw fault code may be caused by one or more of the following:

Shift/Timing Solenoid Malfunction/ 3-2 Shift Solenoid Circuit Electrical
Engine Shutoff Solenoid Malfunction
Ignition Coil A Primary/Secondary Circuit Malfunction
Ambient Air Temperature Sensor Circuit Low
Crankshaft Position Sensor B Circuit Malfunction

What To Check After Fixing 05121 Code

Inspect all the connections exhaust gas temperature sensor, bank 1 sensor 5, 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

05121 Fault Code For Volkswagen Vehicles

The fault code 05121 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 05121 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