Skip to content
KickTyres
Porsche2000–2020 Critical issues documented

Porsche Boxster/Cayman 987: common faults & what to check

The 987 is the Porsche Boxster/Cayman built 2004–2012. It was sold here with the 2.0/2.5 turbo flat-4, 2.7 flat-6 petrol, and 3.4 flat-6 petrol. Of the 9 faults documented for the Boxster/Cayman, 5 apply to this generation, each with its symptoms, what to inspect and a typical repair cost. Free, no account needed.

Check this exact Porsche Boxster/Cayman

  • Odometer history
  • Money owing
  • Reported stolen
  • Ownership history
  • Official NZ vehicle register data
  • NZ owned and operated

Type the plate for the free basics. The full record is a paid check from $13.49, one car at a time, no subscription.

No NZ plate yet, or buying in Australia? Pick the generation and engine and start a free check below. New to KickTyres? How the check works →

9

Documented faults

Critical

Most serious

$900–$4,500

Typical repair

3

Systems covered

You're looking at the 987

3 engine variants are documented for this generation. Pick yours to narrow further, or keep reading for the generation as a whole.

Choose a different generation

Now narrow it to the engine

A 1.8 and a 2.4 of the same car do not fail the same way, so the faults below narrow to the engine as well as the year. Free, no account needed.

A 2006 Porsche Boxster/Cayman is the 987 generation (2004 to 2012).

Start your free check on this Porsche Boxster/Cayman

No plate needed. You get the risk score, the buyer's checklist and the guided inspection for the exact car you picked above — not the whole nameplate.

Porsche Boxster/Cayman 987Engine not picked yet

Pick the engine above first: the Boxster/Cayman came with 3, and without it the report has to show all of their faults. Pick the engine

Free. The paid plate check is separate, and stays optional.

Can't confirm for this car

Porsche Boxster/Cayman · 2006

Narrowed to the year. No engine is recorded for this vehicle. Pick an engine to see which faults apply.

Tell us the engine, or check the engine code on the car, before relying on this.

  • No engine is recorded for this vehicle.

matched on year only

What to look out for

The checks worth doing on a Porsche Boxster/Cayman before you hand over any money. Every documented fault is listed below, each with its own page.

  • Serious issue

    Ask for the IMS retrofit invoice and the most recent oil-filter inspection.

    See why

    IMS bearing failure (986 and 987.1 M96/M97 flat-6)

    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.

    What you would 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)

    Typically $3,500–$35,000 to put right.

  • Costly issue

    Cycle the roof fully open and closed at least three times and watch both sides move evenly.

    See why

    Convertible roof motor, cables and microswitch failures; plastic rear window (986/987 Boxster)

    The Boxster's powered soft-top relies on a motor, push-pull cables, plastic transmission gears and microswitches that wear or fall out of alignment, leaving the roof stuck part-way. Pre-2003 986s also used a plastic rear window that goes hazy and cracks with age and folding. Snapped tension cables and stripped gears are the classic failures; a full top replacement with glass window is the fix for tired early cars.

    What you would notice

    • Roof stops or struggles part-way through its cycle
    • Grinding or clicking during roof operation
    • Hazy, creased or cracked plastic rear window
    • Roof sits unevenly on one side

    Typically $800–$4,500 to put right.

  • Costly issue

    Cold-start the car and watch for smoke.

    See why

    Air-oil separator (AOS) failure (986/987 M96/M97)

    The plastic air-oil separator diaphragm fails with age and lets the engine ingest its own oil, producing dramatic white-blue smoke on start-up and fouling plugs and catalysts. On the mid-engined cars it is buried in a tight engine bay so labour dominates the bill. Common enough that specialists treat it as a wear item.

    What you would notice

    • Cloud of white-blue smoke at start-up
    • Strong suction at the oil filler at idle
    • Rough idle, oil-fouled plugs

    Typically $900–$1,800 to put right.

  • Costly issue

    Check the coolant level and look for dried residue around the reservoir (rear boot area).

    See why

    Coolant expansion reservoir cracking (987/981)

    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.

    What you would notice

    • Sweet coolant smell while driving
    • Slow coolant loss between services
    • Low coolant warning light
    • Crusty residue around the boot-side tank

    Typically $700–$1,500 to put right.

See all 5 issues for this oneDocumented for the exact year and engine you picked, including 2 rated critical.
Engine, transmission & cooling1 critical3

01IMS bearing failure (986 and 987.1 M96/M97 flat-6)

Ask for the IMS retrofit invoice and the most recent oil-filter inspection.petrol2000–2008Engine
OccasionalEngine $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

Parts involved: Clutch.

Ask the seller

  • “Has the IMS bearing been retrofitted, and with which kit?”
  • “Is there any metal in the oil filter at services?”

02Air-oil separator (AOS) failure (986/987 M96/M97)

Cold-start the car and watch for smoke.petrol2000–2008Engine
CommonEngine $900–$1,800 to fix

The plastic air-oil separator diaphragm fails with age and lets the engine ingest its own oil, producing dramatic white-blue smoke on start-up and fouling plugs and catalysts. On the mid-engined cars it is buried in a tight engine bay so labour dominates the bill. Common enough that specialists treat it as a wear item.

Symptoms to notice

  • Cloud of white-blue smoke at start-up
  • Strong suction at the oil filler at idle
  • Rough idle, oil-fouled plugs

What to check

Cold-start the car and watch for smoke. Ask when the AOS was last replaced - on a 100,000 km+ car with no record, treat it as due.

Where to look: On the engine in the sealed mid-engine bay, accessed from under the car or through the service hatch

Parts involved: PCV / oil separator.

Ask the seller

  • “Has the air-oil separator been replaced?”
  • “Does it ever smoke on start-up?”

03Coolant expansion reservoir cracking (987/981)

Check the coolant level and look for dried residue around the reservoir (rear boot area).petrol2005–2016Cooling
CommonCooling $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

  1. Check the coolant level and look for dried residue around the reservoir (rear boot area).
  2. 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

Parts involved: Coolant expansion tank.

Ask the seller

  • “Has the coolant reservoir been replaced?”
  • “How often does the coolant need topping up?”
Body, brakes, suspension & interior1

04Convertible roof motor, cables and microswitch failures; plastic rear window (986/987 Boxster)

Cycle the roof fully open and closed at least three times and watch both sides move evenly.petrol2000–2012Body & RustRead the full fault: symptoms, where to look, what to ask the seller
Depends on the exact engine — 1 moreDocumented for a specific engine we could not confirm from what you picked. Check the engine code on the car.
Engine, transmission & cooling1

01Cylinder bore scoring (987.1, worst on 3.4 Cayman S / Boxster S M97)

Watch for: Cold-start ticking that fades when warm.petrol2005–2008Engine
OccasionalEngine $18,000–$35,000 to fix

Can't confirm for this car

The 3.4-litre M97 in 987.1 S models is susceptible to the same vertical bore scoring as the 997, typically appearing between about 50,000 and 130,000 km, with cylinder 6 running hottest and failing first. It announces itself as a cold-engine tick and sooty left tailpipe before progressing to serious oil consumption and a rebuild-level repair. Specialists consider 987.2 (2009-on) direct-injection cars to have almost entirely resolved the problem.

Symptoms to notice

  • Cold-start ticking that fades when warm
  • One exhaust tip much sootier than the other
  • Rising oil consumption
  • Aluminium debris in the oil filter

What to check

Watch for: Cold-start ticking that fades when warm. If a workshop inspection is possible: Listen to a stone-cold start, compare exhaust tip soot, and insist on a borescope of the bores during the pre-purchase inspection - it is standard practice on these cars and any specialist can do it.

Where to look: Cylinder walls inside the mid-mounted engine; evidence at exhaust tips and oil filter

Ask the seller

  • “Has a borescope inspection been done, and can I see the report?”
  • “What oil is used and how often is it changed?”
Other Porsche Boxster/Cayman engines and years4 documented issues that do not apply to the one you picked.
Engine, transmission & cooling4

01Cracked cylinder liners / coolant-oil mixing (986 M96)

Open the oil filler and look for mayonnaise; check the coolant tank for oil film.petrol2000–2004Engine
RareEngine $15,000–$30,000 to fix

Does not apply

Early M96 blocks used one-piece Lokasil cylinder liners that can crack, letting coolant into the oil and eventually overheating or hydro-locking the engine. It was worst on the pre-2000 2.5 but improved casting only reduced, not eliminated, the fault on later 2.7 and 3.2 986s. The first sign is usually mayonnaise-like emulsified oil under the filler cap or in the coolant tank; by the time the car overheats the engine generally needs a rebuild or replacement.

Symptoms to notice

  • Creamy emulsified residue under the oil filler cap
  • Oil slick in the coolant expansion tank
  • Unexplained coolant loss
  • Overheating

What to check

Open the oil filler and look for mayonnaise; check the coolant tank for oil film. If a workshop inspection is possible: A coolant system pressure test and oil analysis during the pre-purchase inspection will catch a cracked liner early.

Where to look: Inside the engine block; evidence at the oil filler cap (engine bay access hatch) and coolant tank in the boot

Ask the seller

  • “Has the engine ever mixed oil and coolant?”
  • “Has a coolant pressure test been done recently?”

02High oil consumption on early 2.0/2.5 turbo flat-4 (718 MA2)

Check the on-board computer's oil level history if available and look at soot on the tailpipes.petrol2016–2019Engine
OccasionalEngine $3,000–$15,000 to fix

Does not apply

A meaningful number of early 718 flat-4 engines consumed oil at up to a litre per 1,500 km, and low-mileage cars may not yet have shown it. It is hard to spot on a test drive, so history and tailpipe evidence matter. Porsche revised components over the run; persistent heavy consumption on an early car can ultimately mean piston/ring work.

Symptoms to notice

  • Frequent low-oil warnings between services
  • Sooty tailpipes
  • Blue tinge to exhaust under hard acceleration

What to check

  1. Check the on-board computer's oil level history if available and look at soot on the tailpipes.
  2. Ask for service records showing top-up frequency - a litre added every service interval is normal, a litre every few weeks is not.

Where to look: Engine internals; evidence at the tailpipes and oil-level display

Parts involved: Turbocharger.

Ask the seller

  • “How much oil does the car use between services?”
  • “Has Porsche ever done an oil-consumption measurement or engine work under warranty?”

03Front coolant pipe joint leaks and radiator/condenser corrosion (981/718)

Coolant runs from the mid-mounted engine to front radiators through a chain of rubber, plastic and metal pipe joints.petrol2012 onwardCooling
CommonCooling $800–$4,000 to fix

Does not apply

Coolant runs from the mid-mounted engine to front radiators through a chain of rubber, plastic and metal pipe joints; on 981 and 718 cars these joints can weep, showing up as coolant loss around the front wheel wells. The low-mounted radiators and A/C condensers also trap leaves and stones and corrode from the outside, a very common out-of-warranty bill. Mesh grilles and regular cleaning of the intakes largely prevent the radiator damage.

Symptoms to notice

  • Coolant drips or staining near the front wheel arches
  • Air-con performance fading
  • Debris visible in the front intakes
  • Low coolant warnings

What to check

Torch-check the front intakes for packed leaves and corroded fins, and have the front underbody trays dropped during the pre-purchase inspection to inspect pipe joints for staining.

Where to look: Front bumper intakes (radiators/condensers) and coolant pipes running through the front wheel-well area to the sills

Parts involved: Body corrosion, Radiator.

Ask the seller

  • “Have the radiators or condensers been replaced?”
  • “Any history of coolant loss at the front of the car?”

04Turbo coolant line fitting leaks and water pump vacuum seal failure (718 MA2)

Ask whether the updated lines/fittings were ever installed.petrol2016–2020Cooling
OccasionalCooling $800–$2,500 to fix

Does not apply

Early 718s commonly developed coolant leaks at the fittings connecting the coolant supply lines to the turbocharger, and the variable water pump's vacuum seal can fail prematurely, drawing coolant into the vacuum lines. Porsche updated the lines and fittings during the run. Caught early these are moderate repairs; ignored they risk overheating the engine.

Symptoms to notice

  • Coolant smell after hard driving
  • Slow coolant loss
  • Residue around the turbo area
  • Coolant traces in vacuum lines (workshop finding)

What to check

Ask whether the updated lines/fittings were ever installed. If a workshop inspection is possible: Have the pre-purchase inspection include a cooling system pressure test and a look at the turbo coolant fittings for staining.

Where to look: Coolant lines at the turbocharger and the water pump on the mid-mounted engine

Parts involved: Water pump, Turbocharger.

Ask the seller

  • “Have the turbo coolant lines been updated?”
  • “Any coolant loss history?”

Porsche Boxster/Cayman faults in detail

Narrowed to the Porsche Boxster/Cayman · 2006. Each of these has its own page: the symptoms, where to look, what to ask the seller and what the repair costs. Free, no account needed.

Convertible roof motor, cables and microswitch failures; plastic rear window (986/987 Boxster)Major · Body & Rust

Other Porsche models

Porsche Cayenne23 documented faultsPorsche 91118 documented faultsPorsche Macan6 documented faults

Porsche Boxster/Cayman buyer questions

Is the Porsche Boxster/Cayman reliable?

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?

We've catalogued 9 known faults for the Porsche Boxster/Cayman, covering engine, body & rust, and cooling. All 9 are written out in full on this page, with the symptoms to notice, what to inspect, and typical repair costs for each. Free to read, no account needed.

How much do repairs cost on a Porsche Boxster/Cayman?

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?

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 $24.90 far less than the cost of missing one of the faults on this page.