IMS (Intermediate Shaft) Bearing Failure
medium- Typically appears
- 60k–100k+ mi
- Estimated repair
- $8,000 – $15,000
2002 Porsche
BoxsterConvertible
Convertible
The 2002 Porsche Boxster is the second model year of the 986-generation facelift, powered by a mid-mounted 2.7-liter flat-six producing 217 horsepower. It's a true driver's car — balanced, communicative, and genuinely fun — but it carries the financial reality of a used German sports car. Parts and labor are expensive, and this generation is famous for one catastrophic engine weakness that every buyer must understand before handing over a check. At 20+ years old, the 986 Boxster has settled into an accessible price point that makes it tempting as a first sports car. That accessibility is real, but so is the cost to keep one right. Deferred maintenance on these cars compounds quickly. Budget accordingly, find a shop experienced with Porsches, and this car will reward you deeply. For Lake Geneva drivers, keep in mind this is a low-slung, rear-wheel-drive convertible. It is not a four-season car for Wisconsin roads. Most owners store it October through April and treat it as a warm-weather machine.
Reliability
3/5
Verified data
Specs shown for Boxster — the most common configuration.
Other trims may vary in engine, drivetrain, or fuel economy. Sign in to see your vehicle's exact specs.
Engine
[object Object]
Drivetrain
RWD
Fuel
Premium gasoline
MPG
17 city / 25 hwy / 20 combined
Seats
—
Doors
—
Body
Two Seaters
Overview
AI-curatedThe 2002 Porsche Boxster is the second model year of the 986-generation facelift, powered by a mid-mounted 2.7-liter flat-six producing 217 horsepower. It's a true driver's car — balanced, communicative, and genuinely fun — but it carries the financial reality of a used German sports car. Parts and labor are expensive, and this generation is famous for one catastrophic engine weakness that every buyer must understand before handing over a check. At 20+ years old, the 986 Boxster has settled into an accessible price point that makes it tempting as a first sports car. That accessibility is real, but so is the cost to keep one right. Deferred maintenance on these cars compounds quickly. Budget accordingly, find a shop experienced with Porsches, and this car will reward you deeply. For Lake Geneva drivers, keep in mind this is a low-slung, rear-wheel-drive convertible. It is not a four-season car for Wisconsin roads. Most owners store it October through April and treat it as a warm-weather machine.
Known for
- Exceptional mid-engine handling balance and driver feedback
- Reliable flat-six when properly maintained — but vulnerable to IMS bearing failure
- Premium build quality and solid top mechanism for its era
- Strong aftermarket and Porsche Club support
Best for
- Enthusiast drivers who want a true sports car experience
- Warm-season weekend driving and track days
- Owners who can budget for proper German-car maintenance
- Someone with a second, practical daily driver
Watch for
- Intermediate Shaft (IMS) bearing failure — can destroy the engine without warning
- RMS (rear main seal) oil leaks — common and labor-intensive to fix
- Coolant pipe failure behind the engine (AOS and coolant tubes deteriorate with age)
- Convertible top hydraulic leaks and worn top seals letting water into the cabin
- High cost of ownership — routine service at independent shops still runs more than most cars
Common issues by mileage
6 knownRear Main Seal (RMS) Oil Leak
high- Typically appears
- 60k–120k mi
- Estimated repair
- $1,200 – $2,500
AOS (Air-Oil Separator) Failure and Coolant Pipe Deterioration
high- Typically appears
- 60k–100k mi
- Estimated repair
- $600 – $1,800
Convertible Top Hydraulic Leak / Top Seal Failure
high- Typically appears
- Any mileage on 20+ yr old car
- Estimated repair
- $400 – $2,500
Oxygen Sensor / Heater Circuit Faults
medium- Typically appears
- 80k–130k mi
- Estimated repair
- $200 – $600
VarioCAM Camshaft Timing / Solenoid Faults
medium- Typically appears
- 70k–120k mi
- Estimated repair
- $300 – $1,200
Maintenance schedule
- 1 Every 5,000 mi or annually, whichever comes first Engine oil change — use Porsche-approved full synthetic (5W-40)
The flat-six runs hot and the IMS bearing is oil-lubricated. Fresh, clean oil at short intervals is the single cheapest insurance against catastrophic engine failure.
- 2 Once — ideally combined with RMS seal replacement IMS retrofit bearing replacement (if not already done)
This is the most important job on any 986 Boxster. Ask for documented proof it was done before purchase. If unknown, budget for it immediately. Doing both together saves significant labor cost.
- 3 Every 2 years or 30,000 mi Coolant flush and plastic coolant pipe inspection
The coolant pipes and expansion tank behind the engine are plastic and become brittle with age. A burst coolant line can cause overheating and engine damage. Replace proactively on any car over 60k miles.
- 4 Every 30,000 mi Spark plugs replacement
Mid-engine access is tight. Worn plugs cause misfires that stress the catalytic converters — expensive to replace on a Boxster.
- 5 Every spring before first use Convertible top inspection and lubrication of pivot points
Top mechanisms wear when run dry. Inspect seals for cracking, check hydraulic lines for weeping fluid, and ensure the top latches fully to prevent water intrusion.
- 6 Every 2 years regardless of mileage Brake fluid flush
Porsche specifies this interval. Brake fluid absorbs moisture over time, lowering boiling point — a real concern if you ever drive this car on a track or in the hills.
- 7 Monthly pressure check; rotation every 7,500–10,000 mi Tire pressure check and rotation
The staggered tire setup (front and rear sizes differ) means you cannot always rotate conventionally — confirm your setup before scheduling. Low pressure significantly degrades handling on a sports car.
- 8 Every 60,000 mi or at any sign of oil consumption or white smoke AOS (Air-Oil Separator) inspection
A failed AOS pushes oil vapor into the intake, fouling the throttle body and causing rough idle and oil consumption. Catching it early is a $300–$600 fix; ignoring it leads to bigger problems.
Always defer to the manufacturer's service manual for warranty-mandated intervals.
Cost of ownership
Annual maintenance
$1,200 – $3,500
Fuel
Premium (91+ octane) required. At ~20 MPG combined and 8,000–10,000 seasonal miles, budget roughly $1,200–$1,700/year in fuel depending on pump prices.
Insurance
Expect $900–$1,800/year for a pleasure/seasonal use policy in the Lake Geneva area. Agreed-value classic car policies are worth exploring once the car is stored seasonally — often cheaper than standard auto.
A well-maintained 2002 Boxster in normal seasonal use runs $1,200–$3,500/year in routine maintenance (oil, brakes, tires, fluids, top care). The catch is that one deferred repair — especially anything touching the engine rear seal or cooling system — can jump your annual cost to $3,000–$8,000+. The IMS retrofit and RMS seal, if not already done, should be treated as a purchase cost, not a surprise. Own this car only if you have a repair reserve set aside.
Seasonal care
Lake Geneva, WI Winter
- Do NOT drive on salted Wisconsin roads — road salt will rapidly accelerate rust on the underbody, subframe, and exhaust of this 20+ year old sports car. Store it.
- Before storage, change the oil so acidic used oil doesn't sit in the engine all winter.
- Use a quality battery tender (maintainer) all winter — the Boxster's electrical system draws parasitic current and will drain a battery in storage.
- Fill the fuel tank and add a fuel stabilizer before long-term storage to prevent varnish buildup in the fuel system.
- Store on a clean, dry surface — a breathable car cover indoors, not a plastic tarp that traps moisture.
- Inflate tires slightly above normal (3–4 PSI over spec) before storage to reduce flat-spotting during cold months.
Summer
- Check tire pressure monthly — Wisconsin summer heat can add 4–6 PSI above cold inflation pressure; adjust to spec.
- Inspect and top off coolant before the season; verify the expansion tank and plastic coolant pipes show no cracking or seepage.
- Run the A/C briefly before the first hot day to verify it's holding charge — recharging a Boxster A/C system runs $150–$300 at an independent shop.
- Check the convertible top seals and latches each spring; a leaking top lets water pool in the footwells and can destroy carpets and electronics.
Comparable vehicles
2002 BMW
Z3
Similar two-seat RWD roadster from the same era, comparable price point used, inline-six option. Generally cheaper to maintain than the Boxster but less engaging dynamically. Also needs winter storage in Wisconsin.
2002 Honda
S2000
Two-seat RWD roadster with a high-revving engine and legendary reliability — far lower maintenance cost than the Boxster. Less refined interior but dramatically lower ownership risk for the budget-conscious enthusiast.
2002 Chevrolet
Corvette
V8 two-seat RWD convertible at a similar used price. Much cheaper parts and service, more power, but heavier and less nimble than the mid-engine Boxster. Better daily-driver viability.
2002 Porsche
Boxster S
The 3.2L S variant of the same generation offers 252 HP and a more rev-happy flat-six. Similar IMS risk applies but the stronger engine is slightly more resilient. Commands a higher purchase price for a comparable car.
If you're shopping for one
Red flags
- No records of IMS retrofit or any major engine work — walk away or negotiate a very steep discount.
- Engine oil that looks milky or frothy — potential head gasket or coolant intrusion issue.
- Water staining in the footwells or trunk — the front trunk also floods if drain holes clog.
- Convertible top that hesitates, stops mid-cycle, or has visible tears and crazing in the rear window.
- Any smoke from the exhaust on startup, especially blue/white smoke — AOS failure or worse.
- Owner claims it 'just needs a minor tune-up' but can't provide any service history.
What to inspect
- Ask for documented proof of IMS retrofit bearing replacement — this is non-negotiable. If unknown, price it into your offer.
- Check for oil leaks at the rear of the engine (RMS seal) and around the AOS — look for oily residue on the underside behind the engine.
- Operate the convertible top through a full open/close cycle. Listen for hydraulic hesitation, watch for uneven movement, and inspect the top fabric and rear window for cracks or delamination.
- Look inside the footwells for any signs of water staining or damp carpet — a classic symptom of a leaking top seal.
- Check the coolant expansion tank (visible from engine compartment) for cracks, discoloration, or a milky residue that could indicate oil contamination.
- Verify all four windows, door locks, and the HVAC system work — electrical gremlins are common at this age.
- Pull the dipstick and check for frothy or milky oil — a red flag for coolant contamination.
- Have a pre-purchase inspection done by a shop with actual Porsche 986 experience before buying.