Operation CHARM
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Volkswagen Truck
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1994
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Eurovan L5-2459cc 2.5L SOHC
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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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Manufacturer Code Charts
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Engine Control System
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Scan Tool (VAG/VAS) Code Charts
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DTC 00521
DTC 00521
CO potentiometer faulty or open/short circuit. Check wiring and potentiometer.