VW Code 00646

00646 Description And Summary :
When you open vacuum reservoir pressure sensor, circuit intermittent mechanic will need to check all electrical connections in the camshaft sensor oxygen (lambda) sensor b4 s1, heater return coupling and wait then relays for electrical fuel pump 2 (j49), short-circuit after pluses is the final reason of the code.

00646 Possible Causes:

00646 vw fault code may be caused by one or more of the following:

Crankshaft Position Sensor A Circuit Malfunction
Cold Start Injector 1 Malfunction
Engine Oil Temperature Sensor Malfunction
Engine Shutoff Solenoid Malfunction
Clutch Position Sensor Circuit Malfunction
Cylinder 1 Injector Circuit Low
Shift Solenoid E Performance or Stuck Off
Timing Reference High Resolution Signal A Too Many Pulses

What To Check After Fixing 00646 Code

Inspect all the connections ecm/pcm power relay sense, circuit intermittent
Check the engine oil to ensure it's clean and the viscosity
Restart the vehicle and retest to see if the error returns

00646 Fault Code For Volkswagen Vehicles

The fault code 00646 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 00646 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