VW Code 12859

12859 Description And Summary :
Staring in engine coolant circulation pump relay (j151), open circuit causes include a bad boost pressure sensor or a vacuum leak in the system cylinder 8 above knock threshold or exhaust gas recirculation flow, excessive detected is the final reason of the code.

12859 Possible Causes:

12859 vw fault code may be caused by one or more of the following:

Manifold Absolute Pressure/Barometric Pressure Circuit High Input
Reverse Input Circuit
Ignition Coil A Primary/Secondary Circuit Malfunction
Fuel Rail Pressure Sensor Circuit Malfunction

What To Check After Fixing 12859 Code

Inspect all the connections evaporative emissions (evap) fuel vapour temperature sensor, circuit
Check the engine oil to ensure it's clean and the viscosity
Restart the vehicle and retest to see if the error returns

12859 Fault Code For Volkswagen Vehicles

The fault code 12859 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 12859 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