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Which audio unit do you possess? This will be necessary for a response.

I am fairly certain that the orange cable is fibre optic.

NOTE: My S211s were equipped with complete Airmatic, thus this may or may not apply to models with just rear self-leveling. Is the vehicle stationed on a completely flat surface during your inspection? My driveway has a little incline, both longitudinally and laterally, and I saw a minor discrepancy...

The oil level is crucial to monitor; by the time the low pressure indicator activates, damage may occur within seconds. Nevertheless, my 100,000-mile OM 642 has not used any oil throughout the year I have had it; yet, it is equipped with a dipstick for monitoring levels.

The AGM battery I installed previously measured approximately 13 volts.
I would have expected a new acid battery to be approximately 12.5 volts or higher. A 12.2v battery indicates around 50% charge.

Attempt to measure the voltages with the car's body as the ground reference; are they identical?

Remove the input pipe from the front of the engine and assess the impeller; I would wager it exhibits significant axial play.
Furthermore, if you remove the exhaust from the turbocharger, I suppose it will be significantly oily inside.

Turbo is the probable culprit, particularly if it is the N47 twin power turbo, which is known for its propensity to fail.

The connects2 kit preserves the original controls; however, I lost the steering wheel controls, albeit there are YouTube instructions available to assist in resolving this issue.

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