A6 Quattro Sedan V6-3.0L (AVK) (2002)
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Replace that faulty component.
If problem remains at the same cylinder:
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Check electrical connectors of fuel injectors as follows:
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Disconnect connector of fuel injector(s).
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Remove contact pins from the plug housing:
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Push plug out of housing by releasing locking tabs -A-.
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Remove secondary lock -B- upwards.
NOTE:
Use appropriate tool from the VAS 1978 Wiring Repair Kit.
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Push tool into slot -C- and remove female terminals from connector.
With terminals removed from connector:
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Push terminals (trial fit without housing) successively onto the appropriate male terminals of the injector.
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Female terminals should fit snugly.
If the female terminals slide without resistance onto the appropriate injector: