Thinking about buying a used Porsche 911 (1997–2019) in New Zealand? We've documented 17 known faults for this model spanning engine, transmission, suspension, and cooling. Each researched and verified before it's published. The most serious issues here are rated critical. Two are set out in full below — the rest, with the symptoms, repair costs and checks for each, are free with an account.
17
Documented faults
Critical
Most serious
$1,800–$5,000
Typical repair
5
Systems covered
Known Porsche 911 faults
Every fault below is documented specifically for this model — researched and verified before it’s published.
01IMS bearing failure (996/997.1 M96/M97 flat-6)
CriticalOccasionalEngine $4,000–$45,000 to fix
The sealed intermediate shaft (IMS) bearing that drives the camshafts has no oil feed; its grease breaks down and the bearing can disintegrate, throwing the cam timing and destroying the engine. Single-row bearings fitted roughly 2001-2005 are the worst (about 8% failure claimed in the US Eisen class action), dual-row pre-2001 cars around 1%, and the larger non-serviceable bearing in 2006-2008 997.1s fails rarely but cannot be retrofitted without splitting the engine. 997.2 (2009-on), GT3 and Turbo models use a different design and are not affected. A documented ceramic/roller retrofit done with a clutch job largely removes the risk; an actual failure means a full engine rebuild or replacement.
Symptoms to notice
Metallic rattle or knocking from the rear of the engine at idle
Glitter-like metal debris in the oil filter
Oil leak at the engine/gearbox join
Sudden loss of cam timing / engine stops (end stage)
What to check
Ask for the invoice for an IMS retrofit (LN Engineering ceramic or equivalent) and check the oil filter cutting report from the last service. On a pre-purchase inspection have the filter cut open and the sump plug checked for metal. If no retrofit has been done on a 2001-2005 car, price one into your offer.
Where to look: Rear of the engine where it meets the gearbox (flywheel end), only visible with the transmission removed
Ask the seller
“Has the IMS bearing been replaced or retrofitted, and is there an invoice?”
“Which bearing type does this car have (dual-row, single-row, or large non-serviceable)?”
“Was the oil filter inspected for metal at the last service?”
The 991.1 uses several plastic vacuum-operated valves to manage the cooling circuit and intake flaps; the plastic housings crack with age and heat, throwing sporadic 'Cooling system fault' messages and sometimes causing slow coolant loss. Porsche fixed many under warranty in period, but out-of-warranty cars now pay for parts and diagnosis. It is a nuisance fault rather than an engine-killer if attended to promptly.
Symptoms to notice
Intermittent 'Cooling system fault' message on the dash
Slow unexplained coolant loss
Temperature gauge fluctuating
What to check
Scan the car for stored cooling-system fault codes during the pre-purchase inspection and check coolant level against the marks. Ask for records of any warranty valve replacements.
Where to look: Coolant circuit valves around the engine bay and underbody coolant lines
Ask the seller
“Has the car ever shown a cooling system fault message?”
“Were the switching/changeover valves replaced under warranty?”
EngineCritical
EngineCritical
EngineCritical
EngineCritical
TransmissionMajor
EngineMajor
SuspensionMajor
CoolingMajor
Fluid LeaksMajor
Fluid LeaksMajor
CoolingMajor
EngineMajor
EngineMajor
CoolingMajor
EngineMinor
15 more documented faults on the Porsche 911
Symptoms, what to check, where to look and what to ask the seller — for every fault above. Free with an account, no card needed. One account covers one vehicle, so make it the car you’re actually looking at.
This page covers the model. Enter the plate of the actual car you’re looking at and see its year, engine, safety rating and register flags — free, no account needed.
Like any used car, it depends on the specific example and its service history. Across the 17 documented faults for the Porsche 911, the recurring problem areas are engine, transmission, and suspension. A Porsche 911 with a full service history and no signs of the issues listed on this page can be a sound buy but each one needs to be checked individually before you commit.
What are the most common problems with a used Porsche 911?
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We've catalogued 17 known faults for the Porsche 911, covering engine, transmission, and suspension. Two are written out in full on this page. The rest — with the symptoms to notice, what to inspect, and typical repair costs for each — are free once you create an account.
How much do repairs cost on a Porsche 911?
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Most single repairs on the Porsche 911 fall between $1,800–$5,000 at NZ independent-workshop rates. Some of the 17 documented faults cost less and a few cost considerably more, and no one car needs them all. Knowing which ones to look for before you view is what lets you negotiate the price down or walk away.
Should I get a pre-purchase inspection on a Porsche 911?
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Yes. A Porsche 911 inspection focused on its known weak points is the single best way to avoid an expensive mistake. KickTyres gives you a guided, model-specific inspection plus a market valuation and negotiation figure for $17.90 far less than the cost of missing one of the faults on this page.