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P0234 Diagnostic Trouble Code Discussion for February 2015

Turbocharger Engine Overboost

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Trouble Ticket Help Requests for DTC P0234
Help Request Posted
2004 Audi A4 1.8L MIL Lamp on VIN: WAUJC68E94
P0234: Turbo charger/supercharger overboost condition. Customer states mil light is on and runs sluggish Found MAF plug harness has no ignition 12v power and is shorted to ground all the time. When key on, it has 5v ref power from ecm and ground from ecm. All fuses are good. Without 12v power MAF will not work rig...
February 17, 2015