IsItAGoodCar
Reliability Guide

Common Problems with the
2004 Porsche 911 (997)

We've identified 1 known issue that can affect the 2004 Porsche 911 (997). 1 of these are serious faults that could be expensive to repair.

1
Known Issues
1
Serious
0
Moderate
0
Minor

All Known Issues

Bore Scoring (Gen 1)

SeriousEngine

The Lokasil/Alusil cylinder liners degrade, causing the piston to score the walls. Eventually requires a full rebuild.

Est. Repair Cost: £8,000–£12,000 (rebuild)
Warning Signs:

Ticking noise at idle, High oil consumption, Sooty left exhaust tip

What to Inspect:
  • Get a specialist bore scope inspection
  • Listen for a rhythmic "slap" when warm
Verified by IsItAGoodCar Research Team

Buying Tips for 2004 Porsche 911 (997)

  • ✓On 997.1 models, check if an IMS retrofit or a larger factory bearing is fitted.
  • ✓Look for sootier residue on the left exhaust tip, which can be an early sign of bore scoring.
  • ✓Verify the operation of the PASM dampers; leaking struts are common on S models.
2005
Check a 2004 Porsche 911 (997) by Registration