S5 Quattro Coupe V8-4.2L (CAUA) (2009)
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Remove the spark plugs with Spark Plug Removal Tool (3122 B).
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Check compression pressure using the Compression Tester (V.A.G 1763).
‹› Using tester => operating instructions.
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Have a second technician press the accelerator pedal down all the way while operating the starter until the pressure increase is no longer displayed
on the tester.
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Repeat procedure on each cylinder.
Assembly is in reverse order of removal, note the following:
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Install spark plugs.
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Install rear noise insulation.
Faults are saved in ECM when electrical connectors are disconnected:
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Connect Vehicle Diagnosis, Testing and Information System (VAS 5051B).
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Start "Guided Functions" operating mode.
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Generate readiness code in ECM.
