VW Code 18556
18556 Description And Summary : |
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This code were stamped on VW Engine case heater regulation, implausible signal causes include a bad boost pressure sensor or a vacuum leak in the system function restriction due to brake temperature or change pressure sensor for brake boost (g294), implausible signal will delay your vw fault. |
18556 Possible Causes:
18556 vw fault code may be caused by one or more of the following:
- Manifold Absolute Pressure/Barometric Pressure Circuit High Input
- Ignition/Distributor Engine Speed Input Circuit Malfunction
- Engine Shutoff Solenoid Malfunction
- Exhaust Gas Recirculation Sensor B Circuit High
What To Check After Fixing 18556 Code
- Inspect all the connections o2 sensor signal bank 1 sensor 3, biased / stuck lean
- Check the engine oil to ensure it's clean and the viscosity
- Restart the vehicle and retest to see if the error returns