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If no sim card is working in the audio unit it is more than likely an audio unit fault but to be 100% sure it needs to go on a Porsche diagnostic machine and read out faults. This is because the audio unit is a module called PCM which controls all the entertainment systems on that vehicle. Also the aerial need to be check but can also be done at the same time
The most serious common faults are with the standard 3.4 engine in the early 996 Carrera models (not applicable to Turbo engined vehicles which is a different engine design):
1. The engine cylinder liners develop hairline cracks. (Engine replacement or rebuild required).
2. The intermediate shaft bearings fail in these engines (a well known design fault). Failure requires engine replacement.
3. The rear main seals in the engines fail as exhibited by a slowly worsening oil leak. The seal needs to be replaced when they leak. It's an expensive job.
Problems 1 and 2 are serious have resulted in many engine replacements. Problems 2 and 3 remained when Porsche upgraded to the standard 3.6 engine in the series two 996 Carrera models (problems not applicable to Turbo engines)..
There are a few other issues such as Air Conditioning condensers that clog up with road debris and eventually become porous and fail.