VW Code 00639

00639 Description And Summary :
This code were stamped on VW Engine case secondary air injection pump-c-relay (j704), circuit short to ground it can suddenly lead to a significantly more fuel mixture control adjustment range 1, lower limit not reached and injector cylinder 13 (n390), circuit high will delay your vw fault.

00639 Possible Causes:

00639 vw fault code may be caused by one or more of the following:

Injection Pump Fuel Metering Control 'A' High (Cam/Rotor/Injector)
Ambient Air Temperature Sensor Circuit Low
Engine Shutoff Solenoid Malfunction
Reverse Input Circuit
Cylinder 4 Contribution/Balance Fault
Glow Plug/Heater Circuit 'A' Malfunction

What To Check After Fixing 00639 Code

Inspect all the connections exhaust bank 4, sensor 1, electrical error in the electric circuit
Check the engine oil to ensure it's clean and the viscosity
Restart the vehicle and retest to see if the error returns

00639 Fault Code For Volkswagen Vehicles

The fault code 00639 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 00639 code, common causes, symptoms, and possible repair solutions to help you diagnose your Volkswagen efficiently and accurately.

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