S6 Quattro Sedan V10-5.2L (BXA) (2007)
1. Knock Sensor (KS) 2 (G66) (gray connector)
2. Knock Sensor (KS) 1 (G61) (orange connector)
3. Knock Sensor 3 (G198) (white connector)
4. Knock sensor 4 (G199) (blue connector)
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Disconnect connector from the Fuel Metering Valve (N290) - 1 - and from the Fuel Metering Valve 2 (N402) - 2 -.
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Disconnect left and right electrical connectors - 2 - on Camshaft Position (CMP) Sensor (G40) and on Camshaft Position (CMP) Sensor 2 (G163)
on cylinder head.
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Remove Ground (GND) wire - 1 - at right and left from cylinder head.