A6 Quattro Sedan V6-2.7L Turbo (APB) (2000)
If LED does not blink or if it remains constantly lit:
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Connect VAG1598/31 test box at wiring harness to ECM, do not connect ECM.
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Check following wire connections for open circuit and short circuit to Ground (GND) and B+:
Valve 1 for camshaft adjustment -N205- and valve 2 for camshaft adjustment -N208
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Repair Ground (GND) connection or open circuit if necessary.
If wire connection is OK:
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Replace Engine Control Module (ECM).
If no malfunctions are detected:
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Replace mechanical camshaft adjuster