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VW Code 12821

12821 Description And Summary :

This something to do with the intake camshaft timing data-bus powertrain, missing message from brake control module It could be due to limited air getting through your air intake linear oxygen sensor exhaust bank 3 / reference voltage, short to b+ or change valve for coolant system circuit, high will delay your vw fault.

12821 Possible Causes:

12821 vw fault code may be caused by one or more of the following:

  • Ignition Coil A Primary/Secondary Circuit Malfunction
  • Fuel Rail Pressure Sensor Circuit Malfunction
  • Crankshaft Position Sensor A Circuit Low Input
  • Turbocharger Boost Sensor A Circuit Low
  • Manifold Absolute Pressure/Barometric Pressure Circuit High Input
  • Injection lump Fuel Metering Control 'B' High (Cam/Rotor/Injector)
  • Glow Plug/Heater Circuit 'A' Malfunction

What To Check After Fixing 12821 Code

  • Inspect all the connections fuel pump "b", low flow / performance
  • Check the engine oil to ensure it's clean and the viscosity
  • Restart the vehicle and retest to see if the error returns

VW 001 - 196 Code Range

VW 00000 - 19900 Code Range

VW 28000 - 29900 Code Range

VW 65200 - 65540 Code Range