Porsche 911 (997)
The 997 is split into Gen 1 (M96/M97 engine) with IMS/Bore scoring risks, and Gen 2 (MA1 engine) which is significantly more robust but introduced the PDK gearbox.
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Common Faults & Reliability
These are the most common documented problems for the Porsche 911 (997), sorted by their typical impact and frequency.
Bore Scoring (Gen 1)
high severityThe Lokasil/Alusil cylinder liners degrade, causing the piston to score the walls. Eventually requires a full rebuild.
PDK Distance Sensor Failure
high severityAn internal sensor in the PDK gearbox fails, rendering the car undriveable. Porsche dealers typically quote £20,000–£30,000 for a full gearbox replacement as they do not repair internal parts. However, UK specialists like Ninemeister and Zuffenhaus can now repair the unit by replacing the faulty component with an upgraded T-Design9 sensor.
IMS Bearing (997.1)
high severityWhile the 997.1 uses a larger bearing than the 996, early 2005 models still use the smaller bearing. Later 997.1 cars use a larger, more robust bearing but failure is still possible.
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