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2021
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A4 Quattro Premium Plus, 2.0L Eng VIN B
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Repair and Diagnosis
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General Information
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Abbreviations
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Emission Control Abbreviations
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"W"
Emission Control Abbreviations: "W"
WU
Warm-Up Catalyst
WU-OC
Warm-Up Oxidation Converter
WU-TWC
Warm-Up Three-Way Catalytic Converter