IsItAGoodCar
Reliability Guide

Common Problems with the
2004 Porsche Cayenne (955/957)

We've identified 3 known issues that can affect the 2004 Porsche Cayenne (955/957). 2 of these are serious faults that could be expensive to repair.

3
Known Issues
2
Serious
1
Moderate
0
Minor

All Known Issues

Plastic Coolant Pipe Failure (955 V8)

SeriousCooling System

The original plastic pipes under the intake manifold fail and leak coolant onto the starter motor.

Est. Repair Cost: £1,200–£1,600
Warning Signs:

Sudden coolant loss, Steam from the engine bay

What to Inspect:
  • Look for aluminium pipe upgrade in history
Verified by IsItAGoodCar Research Team

Bore Scoring (4.5 V8)

SeriousEngine

Catastrophic wear to the cylinder liners, most common on early 4.5L V8 engines.

Est. Repair Cost: £6,000–£10,000+
Warning Signs:

Ticking noise, High oil consumption, Smoke from exhaust

What to Inspect:
  • Perform a cold-start check for knocking/ticking
Verified by IsItAGoodCar Research Team

Driveshaft Carrier Bearing Failure

ModerateGearbox & Transmission

The centre support bearing on the cardan shaft fails, causing a thumping noise under the centre console. A near-certain failure point on all 955/957 models.

Est. Repair Cost: £300–£600
Warning Signs:

Thumping under centre console, Vibration during acceleration, Clunking over speed bumps

What to Inspect:
  • Listen for thumping from centre of car
  • Inspect carrier bearing for play
Verified by IsItAGoodCar Research Team

Buying Tips for 2004 Porsche Cayenne (955/957)

  • On 955 V8s, verify if the plastic coolant pipes have been upgraded to aluminium.
  • Listen for a "thumping" under the centre console, indicating a failed propshaft bearing.
  • Check the carpets for dampness; clogged drains can flood the ECU/wiring.
Check a 2004 Porsche Cayenne (955/957) by Registration