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
P2019
Intake Manifold Runner Position Sensor/Switch Circuit Bank 2
Fuel and Air Metering
High severity
P2021
Intake Manifold Runner Position Sensor/Switch Circuit Low Bank 2
Fuel and Air Metering
High severity
P2022
Intake Manifold Runner Position Sensor/Switch Circuit High Bank 2
Fuel and Air Metering
High severity
P1981
Issue in secondary air injection valve (controls emission)
Volkswagen
Auxiliary Emissions Control
High severity
P1986
Short circuit detected in engine coolant control module
Volkswagen
Computer Output Circuit
High severity
U0197
Internal malfunction detected in Telephone control module
Mercedes Benz
Communication Network System
High severity
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