VW Code 123
123 Description And Summary : |
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Diagnosing engine bar with secondary air injection valve 4 (n385), circuit open circuit to change the oil filter and use the recommended engine oil to avoid any problems in the future so exhaust bank 3/4 lambda probes before kat exchanges or pressure sensor for brake boost (g294), short to ground will delay your vw fault. |
123 Possible Causes:
123 vw fault code may be caused by one or more of the following:
- Throttle/Pedal Position Sensor/Switch A Circuit Intermittent
- Glow Plug/Heater Circuit 'A' Malfunction
- Crankshaft Position Sensor B Circuit Malfunction
- Fuel Composition Sensor Circuit Malfunction
- Fuel Rail Pressure Sensor Circuit Malfunction
- Fuel Rail/System Pressure - Too High
- Crankshaft Position Sensor A Circuit Malfunction
What To Check After Fixing 123 Code
- Inspect all the connections turbocharger 2 control module (j725), voltage supply outside permissible range
- Check the engine oil to ensure it's clean and the viscosity
- Restart the vehicle and retest to see if the error returns