OBD fault code library
Look up any P or U code to see what it means, what causes it, the parts involved and how it gets fixed.
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Fault codes
P1009
Air Mass Meter 1/2 Implausible Signal From Load Detection
Audi
Fuel and Air Metering
High severity
P1018
Intake Manifold Runner Bank 2 Lower Limit Not Reached
Audi
Fuel and Air Metering
High severity
P1030
Intake Manifold Air Control Valve Position Sensor Lower Limit Not Reached
Audi
Fuel and Air Metering
High severity
P1034
Nitrogen Oxides Sensor Signal Outside Tolerance
Audi
Auxiliary Emissions Control
Medium severity
P1051
Brake Switch Signal Missing or Improper
Audi
Vehicle Speed and Idle Control System
High severity
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