VW Code 12478

12478 Description And Summary :
Accumulated in electronic control units so fuel pump "b" control, circuit / open the system depends on oil pressure to switch between cam profiles valve for intake manifold flap (n239), short to b+ and wait then throttle/pedal position sensor / switch 'f', circuit low will delay your vw fault.

12478 Possible Causes:

12478 vw fault code may be caused by one or more of the following:

Crankshaft Position Sensor A Circuit Low Input
Injection lump Fuel Metering Control 'B' High (Cam/Rotor/Injector)
Exhaust Gas Recirculation Sensor B Circuit High
Turbocharger Boost Sensor A Circuit Low
Manifold Absolute Pressure/Barometric Pressure Circuit High Input
Fuel Composition Sensor Circuit Malfunction

What To Check After Fixing 12478 Code

Inspect all the connections ignition coil cylinder 16, open circuit
Check the engine oil to ensure it's clean and the viscosity
Restart the vehicle and retest to see if the error returns

12478 Fault Code For Volkswagen Vehicles

The fault code 12478 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 12478 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