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2005 Mercedes-Benz S600 Questions

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OBDII Monitors Not Ready - Secondary Air System. How do I fix this issue? Do I need to replace the SAS pump and relay valve for the Smog test to pass?
Whenever I need to get my car moving quickly it makes a hard sort of noise coming from up under the car beneath the drivers feet. Its not the engine its either the catalytic converter or back pressure from the turbo I think. Anybody else have this issue?
Had battery replace and when set awhile the battery die.
Fault code said left ignition coil was bad so I replaced that along with the spark plugs and the car is the same. When I pull car out of garage in morning it usually runs ok but driving to work it starts acting up and loses power.
i am changing the dash
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