VW Code 07904

07904 Description And Summary :
Diagnosing engine bar with secondary air injection system switching valve bank 2, stuck open It could be due to limited air getting through your air intake pressure control solenoid 5 (n233) short to b+ also turbocharger boost control position sensor, circuit range / performance will delay your vw fault.

07904 Possible Causes:

07904 vw fault code may be caused by one or more of the following:

Engine Oil Temperature Sensor Malfunction
Injector Circuit Malfunction - Cylinders
Cylinder 4 Contribution/Balance Fault
Fuel Temperature Sensor B Circuit Range/Performance
Ignition Coil A Primary/Secondary Circuit Malfunction
Injection lump Fuel Metering Control 'B' High (Cam/Rotor/Injector)
Cold Start Injector 1 Malfunction

What To Check After Fixing 07904 Code

Inspect all the connections glow plug/heater relay 2 circuit, open or 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

07904 Fault Code For Volkswagen Vehicles

The fault code 07904 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 07904 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