Porsche Turbo S
The 4.8L biturbo from 2007 is the most powerful Cayenne engine of the 955/957 era at 500 hp in the Turbo and 550 hp in the Turbo S. The turbo delivery is overwhelming — 800 Nm is available practically everywhere, and the SUV moves with a lightness that surprises despite 2.5 tonnes. Technically the same risks apply as all Cayenne V8 engines of this era: coolant lines, piston slap risk, ignition coils and especially the crankcase ventilation, which is even more critical on turbo engines than on the naturally aspirated. Purchase price and running costs are at a high level — anyone choosing the Turbo must factor that in.
Turbo S — sports car performance in an SUV body
The Cayenne Turbo S defines a class that didn't exist before: over 400 kW in a 2.3-tonne SUV, 0–100 in under 4.5 seconds, lap times at sports car level. On the motorway it accelerates like a 911 Turbo, on back roads surprisingly agile thanks to PDCC and rear-wheel steering. Absurd, impressive, irrational — and exactly that makes it great.
Engine Weaknesses 6
The high engine load of the Turbo S stresses the timing chain tensioner more. Regular inspection recommended above 100,000 km.
Symptoms: Timing chain rattle on cold start, especially in the first few seconds
Alusil cylinder coating detaches, pistons tilt and seize. Particularly common with short-trip driving and long oil change intervals. Repair €5,500–23,000.
Symptoms: Knocking from the engine bay that subsides after warm-up, blue smoke, power loss
Crankcase breather fails and draws oil into the intake tract or turbo. In documented cases this led to total engine failure through oil starvation.
Symptoms: Heavy blue smoke, extremely elevated oil consumption, turbo overheating
Twin-turbo with high thermal load. Wastegate valves fail more often than on the naturally aspirated engine.
Symptoms: Boost fault, limp mode, engine check light P0234/P0299
The 8 ignition coils on the V8 fail from heat and vibration. Individual or multiple coils need regular replacement.
Symptoms: Stumbling at idle, misfires, engine check light
The left MAF sensor connector loses its locking tab from vibration. The MAF signal drops out sporadically and mimics other faults.
Symptoms: Stumbling on warm engine, rough idle, sporadic fault codes
Vehicle Weaknesses 9
Air suspension compressor fails through overloading. Most common cause: leaking air bags force the compressor to run continuously. Vehicle sags.
The Cayenne 955 is prone to rust on sills, door bottom edges and rear wings. Stone chips accelerate corrosion considerably. Cavity sealing recommended.
Electronic steering column lock (ELV) engages after a deeply discharged battery. Vehicle can neither be started nor steered.
Design fault with the sunroof drains. Blockage leads to water ingress into the interior. Regular cleaning of the drain channels required.
Propshaft centre bearing wears and causes vibrations. Simple repair, but if ignored, secondary gearbox damage can follow.
Mechanical parking brake seizes in cold weather or corrodes from disuse. Brake cables stretch and need adjustment.
A/C compressor and interior blower fail through age and overheating. Condenser and compressor often need to be replaced together.
Tailgate gas struts lose pressure over time. The tailgate only opens halfway or falls down onto your head while loading.
Plastic trims and foam parts become brittle, fade and creak. Door cards and headliner fabric come loose.
Reports & Tests
257 owner complaints filed with NHTSA (2002–2010). Most reported: Powertrain (54), Fuel System (48), Engine (39).