The ignition system must be maintained—distributor caps, rotors, and cables require attention. The misfire detection system can cause the engine to shut down by half. The root cause of the problem must be ascertained before repair.
The hydraulic fluid for the clutch system may be overlooked; the fluid should be replaced regularly during brake fluid service. If aging or contaminated fluid is not replaced, there may be problems in the lines and actuating components, as well as clutch issues that are difficult to diagnose.
Due to wear in the differential multi-disc clutch, the PSD (Porsche Slip Differential) locking system light may illuminate. The independent hydraulic fluid supply for the PSD needs to be maintained properly, including the filling/replacement of fluid before problems develop.