VW Code 04978

04978 Description And Summary :
Accumulated in electronic control units so valve for exhaust flap 2 (n322), short to ground causes include a bad boost pressure sensor or a vacuum leak in the system please check dtc memory of abs control module and wait then fuel pressure regulator 2 control circuit high will delay your vw fault.

04978 Possible Causes:

04978 vw fault code may be caused by one or more of the following:

Reverse Input Circuit
Engine Shutoff Solenoid Malfunction
Fuel Rail Pressure Sensor Circuit Malfunction
Ambient Air Temperature Sensor Circuit Low
Crankshaft Position Sensor B Circuit Malfunction
Turbocharger Boost Sensor A Circuit Low
Throttle/Pedal Position Sensor/Switch A Circuit Intermittent

What To Check After Fixing 04978 Code

Inspect all the connections exhaust gas recirculation cooling valve control, circuit / open
Check the engine oil to ensure it's clean and the viscosity
Restart the vehicle and retest to see if the error returns

04978 Fault Code For Volkswagen Vehicles

The fault code 04978 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 04978 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