IsItAGoodCar
Reliability Guide

Common Problems with the
2008 Porsche 911 (997)

We've identified 3 known issues that can affect the 2008 Porsche 911 (997). 2 of these are serious faults that could be expensive to repair.

3
Known Issues
2
Serious
1
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
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IMS Bearing (997.1)

SeriousEngine

While 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.

Est. Repair Cost: £1,500–£2,500 (preventative)
Warning Signs:

Metal debris in oil filter, Oil leak near rear main seal area, Sudden engine failure

What to Inspect:
  • Ask if IMS upgrade has been fitted
  • Check if car is a 2005 model year (highest risk)
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Cracked Ignition Coil Packs

ModerateEngine

The coil packs on 997 engines are prone to cracking and failing, causing misfires. A relatively inexpensive fix but common across all variants.

Est. Repair Cost: £200–£400
Warning Signs:

Engine misfire, Check engine light, Rough idle, Hesitation under acceleration

What to Inspect:
  • Scan for misfire codes
  • Inspect coil packs for visible cracks
Verified by IsItAGoodCar Research Team

Buying Tips for 2008 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.
Check a 2008 Porsche 911 (997) by Registration