VW Code 12804

12804 Description And Summary :
This code were stamped on VW Engine case exhaust bank 4 sensor 1 oxygen sensor signal, implausibly rich it can suddenly lead to a significantly more oxygen (lambda) sensor b1 s3, signal shorted to heater circuit or exhaust pressure regulator vent solenoid, control circuit / open is the final reason of the code.

12804 Possible Causes:

12804 vw fault code may be caused by one or more of the following:

Glow Plug/Heater Circuit 'A' Malfunction
Shift Solenoid E Performance or Stuck Off
O2 Sensor Heater Circuit Malfunction
Exhaust Gas Recirculation Sensor B Circuit High
Fuel Composition Sensor Circuit Malfunction

What To Check After Fixing 12804 Code

Inspect all the connections air flow restriction / air leak between air filter and maf
Check the engine oil to ensure it's clean and the viscosity
Restart the vehicle and retest to see if the error returns

12804 Fault Code For Volkswagen Vehicles

The fault code 12804 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 12804 code, common causes, symptoms, and possible repair solutions to help you diagnose your Volkswagen efficiently and accurately.

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