Porsche Boxster/Cayman: common faults & what to check
Thinking about buying a used Porsche Boxster/Cayman (2000–2020) in New Zealand? We've documented 9 known faults for this model spanning engine, body & rust, 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.
9
Documented faults
Critical
Most serious
$900–$4,500
Typical repair
3
Systems covered
Known Porsche Boxster/Cayman faults
Every fault below is documented specifically for this model — researched and verified before it’s published.
01IMS bearing failure (986 and 987.1 M96/M97 flat-6)
CriticalOccasionalEngine $3,500–$35,000 to fix
Like the same-era 911, the Boxster's intermediate shaft bearing is a sealed unit with no oil feed that can disintegrate and destroy the engine. Single-row bearings in roughly 2001-2005 cars are the highest risk (about 8% claimed in the US class action), pre-2001 dual-row cars much lower, and 2006-2008 987s use a larger non-serviceable bearing that fails rarely but cannot be retrofitted without an engine teardown. All 987.2 cars from model year 2009 have the redesigned direct-injection engine with no IMS issue. A documented retrofit done with a clutch job is the accepted fix on serviceable cars.
Symptoms to notice
Metallic rattle from behind the seats at idle
Metal glitter in the oil filter
Oil leak at the engine/gearbox join
Sudden catastrophic engine failure (end stage)
What to check
Ask for the IMS retrofit invoice and the most recent oil-filter inspection. On the pre-purchase inspection have the filter cut and the sump checked for debris. On a 2001-2005 car without a retrofit, budget for one immediately.
Where to look: Flywheel end of the mid-mounted engine, behind the seats; accessible only with the gearbox out
Ask the seller
“Has the IMS bearing been retrofitted, and with which kit?”
“Is there any metal in the oil filter at services?”
02Coolant expansion reservoir cracking (987/981)
MajorCommonCooling $700–$1,500 to fix
The plastic coolant reservoir on 987 and 981 cars cracks at its seams from age and heat cycles, often starting as a faint coolant smell and slow loss before splitting and dumping coolant. On these mid-engined cars the tank lives in the boot area beside the engine, so access is awkward and labour is most of the bill. Left alone it risks overheating an otherwise healthy engine.
Symptoms to notice
Sweet coolant smell while driving
Slow coolant loss between services
Low coolant warning light
Crusty residue around the boot-side tank
What to check
Check the coolant level and look for dried residue around the reservoir (rear boot area). Ask the seller how often they top up coolant - any regular topping up means the tank or pipes are leaking.
Where to look: Coolant reservoir beside the engine bay, accessed from the rear boot
Ask the seller
“Has the coolant reservoir been replaced?”
“How often does the coolant need topping up?”
EngineCritical
EngineCritical
EngineMajor
Body & RustMajor
CoolingMajor
CoolingMajor
EngineMajor
7 more documented faults on the Porsche Boxster/Cayman
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 9 documented faults for the Porsche Boxster/Cayman, the recurring problem areas are engine, body & rust, and cooling. A Porsche Boxster/Cayman 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 Boxster/Cayman?
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We've catalogued 9 known faults for the Porsche Boxster/Cayman, covering engine, body & rust, and cooling. 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 Boxster/Cayman?
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Most single repairs on the Porsche Boxster/Cayman fall between $900–$4,500 at NZ independent-workshop rates. Some of the 9 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 Boxster/Cayman?
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Yes. A Porsche Boxster/Cayman 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.