FREE REPAIR MANUALS & LABOR GUIDES 1982-2013 Vehicles
Courtesy of Operation CHARM
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Car repair manuals for everyone.
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2001
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Jetta GLS Sedan (9M2) L4-2.0L (AEG)
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Repair and Diagnosis
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A L L Diagnostic Trouble Codes ( DTC )
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Testing and Inspection
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P Code Charts
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P1521
P1521
P1521/VAG 17729
= Knock Sensor Circuit Low Input.
Knock Sensors, Checking