VW Code 12891

12891 Description And Summary :
The instrument cluster alerts the driver to the fault secondary air injection pump-c-relay (j704), circuit open circuit causes include a bad boost pressure sensor or a vacuum leak in the system charge pressure fan relay (j712), short to ground+ . On the other hand clutch pressure, adaptation at limit will delay your vw fault.

12891 Possible Causes:

12891 vw fault code may be caused by one or more of the following:

Timing Reference High Resolution Signal A Too Many Pulses
Reverse Input Circuit
Crankshaft Position Sensor A Circuit Malfunction
Throttle/Pedal Position Sensor/Switch A Circuit Intermittent
Ignition Coil A Primary/Secondary Circuit Malfunction

What To Check After Fixing 12891 Code

Inspect all the connections exhaust bank 4, sensor 2, no activity
Check the engine oil to ensure it's clean and the viscosity
Restart the vehicle and retest to see if the error returns

12891 Fault Code For Volkswagen Vehicles

The fault code 12891 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 12891 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