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996.2 · 2002–2005

2003 Porsche Carrera 4S

3.6 L flat 6 · AWD · Coupe / Cabriolet · water-cooled

Power
320hp
Torque
273lb-ft
0–60
5.0s
Weight
3,250lb
lb / hp
10.2
Displacement
3.6L

Specification

US-market 2003
Power 320 hp
247 700
Weight 3,250 lb
2,910 3,640
Weight to power 10.2 lb/hp
4.6 lower is quicker 13.0

Where this car sits against every 911 in the catalog.

Engine
Engine code M96.03
Layout flat 6, water-cooled
Displacement 3.6 L
Aspiration Naturally aspirated
Power 320 hp @ 6,800 rpm
Torque 273 lb-ft @ 4,250 rpm
Redline 7,300 rpm
Specific output 89 hp / L
Chassis & body
Drivetrain All-wheel drive
Body styles Coupe, Cabriolet
Transmissions 6-speed Manual · 5-speed Tiptronic
Curb weight 3,250 lb
Wheelbase 92.6 in
Length 174.5 in
Width 72.0 in
Height 51.4 in
Performance & market
0–60 mph 5.0 s
Top speed 174 mph
Weight to power 10.2 lb / hp
MSRP when new $79,000 base

About the 2003 Carrera 4S

2003GT2 joins the US range with 477 hp and rear-wheel drive.

Carrera 4STurbo wide body, Turbo brakes and suspension, no turbochargers. The 996 most people actually want.

Known issues

6 Specific to the Carrera 4S

IMS bearing failure

Critical $1,800–$3,500
Affects

M96 engines, 1999–2005. Not the Turbo, GT2 or GT3 — those use the Mezger engine and have no IMS bearing of this design.

What happens

The intermediate shaft that drives the camshafts rides on a sealed ball bearing at the rear of the block. The seal fails, grease washes out, the bearing runs dry and disintegrates. Debris circulates and the shaft loses position — valves meet pistons. The engine is generally not economically repairable.

Symptoms
  • Metal flake or fine glitter in the oil filter or drain oil
  • Faint rumble from the rear of the engine at idle
  • Oil weeping from the IMS flange area
  • Often no warning at all before catastrophic failure
What to do

A retrofit bearing during a clutch job, when the transmission is already out. Single-row bearings (roughly MY2000–2005) are replaceable with an upgraded cartridge or a pressure-fed solution. The 2005–2008 large non-serviceable bearing cannot be swapped without splitting the case.

Parts for this job

Rear main seal leak

Major $1,200–$2,200
Affects

All M96 cars, most commonly early build years.

What happens

The crankshaft seal at the bell housing weeps oil. Rarely dangerous on its own, but it wets the clutch and it is the classic reason a 996 sits with a drip.

Symptoms
  • Oil drops directly under the bell housing
  • Oil film on the underside of the transmission
  • Clutch shudder if the disc has been contaminated
What to do

Replace during any clutch or IMS job — the labor is already paid for. Doing it alone is expensive labor for a cheap part.

Cylinder bore scoring

Critical $12,000–$25,000
Affects

Predominantly the 3.6 L M96.03 (2002–2005), typically cylinders 4 and 6.

What happens

The Lokasil cylinder liner surface breaks down and the piston skirt scores the bore. Oil consumption climbs, compression drops, and the fix is a full engine rebuild or replacement.

Symptoms
  • Oil consumption beyond roughly a quart per 1,000 miles
  • Cold-start ticking that fades as the engine warms
  • Smoke on startup or under load
  • Low or uneven compression and leak-down on cylinders 4 and 6
What to do

No preventive fix. Buy on the strength of a borescope inspection of every cylinder — this is the single highest-value item in a 996 pre-purchase inspection.

Air–oil separator failure

Major $600–$1,100
Affects

All M96 cars.

What happens

The AOS separates oil mist from crankcase vapor. When its diaphragm tears, the engine draws oil directly into the intake and burns it.

Symptoms
  • Dense white smoke, often dramatic, at startup or under throttle
  • Rough idle
  • Oil consumption with no external leak
  • Vacuum-like hiss from the engine bay
What to do

Replace the AOS. A common and comparatively cheap repair — but its smoke display panics owners into fearing the far more expensive problems above.

Parts for this job

Ignition switch failure

Minor $250–$600
Affects

All 996 and early 986, subject of a service campaign.

What happens

The electrical portion of the switch fails, leaving the car dead or unable to shut off.

Symptoms
  • No crank, no dash lights
  • Key turns with no response
  • Car will not shut off with the key
What to do

Replace the switch — an inexpensive part behind moderate labor.

Parts for this job

Radiator debris and corrosion

Minor $900–$2,400
Affects

All 996, worst in road-salt and leaf-litter regions.

What happens

The front radiators sit low and collect leaves and grit that hold moisture against the cores. Corrosion follows, then leaks, then A/C condenser damage behind them.

Symptoms
  • Slow coolant loss with no visible leak
  • A/C performance drop
  • Debris visible through the bumper ducts
What to do

Clean the ducts annually, fit radiator grilles. Replace both radiators and condensers together once they start weeping.

Parts for this job
Does not affect this car

Glued coolant pipe separation — documented elsewhere in the 996.2 range but not applicable to the Carrera 4S. See the generation overview for the full picture.

Service intervals

9
Item Interval
Engine oil and filter 5,000 mi or annually
Spark plugs 30,000–40,000 mi
Serpentine belt 4 years / 40,000 mi
Coolant 4 years
Brake fluid 2 years
Clutch 60,000–100,000 mi
Transmission fluid 60,000 mi
Air–oil separator On failure
Suspension bushings and mounts 80,000+ mi

What fits this car

36 Sizes, capacities and part specs

The answers you need when something has already failed — bulb sizes by position, wiper lengths, battery group, fluid specs and capacities. Sizes are for US-spec cars and are a starting point: options and mid-year changes move them, so check against your own car and its VIN before ordering.

Bulbs

13 Positions and sizes for US-spec cars. Xenon cars differ at the low beam.
Low beam — halogen H7 55W ✓ Cars without the Litronic xenon option. Shop →
Low beam — Litronic xenon D2S 35W ✓ Factory xenon option. Do not fit an HID kit into a halogen housing — the reflector is the wrong shape and it blinds oncoming traffic. Shop →
High beam — halogen (996.2) H9 65W ✓ The facelift changed the high beam from H7 to H9. Ordering H7 for a 2002-on halogen car is a common and easy mistake. Shop →
High beam — Litronic cars H7 55W ✓ Xenon cars keep a halogen high beam. Shop →
Front turn signal PY21W Amber. A silver-coated bulb keeps the lens looking clear when off. Shop →
Front position / parking W5W Shop →
Fog light H3 55W ✓ Shop →
Brake / tail P21/5W Dual filament — one bulb serves both. Shop →
Rear turn signal PY21W Shop →
Reverse P21W Shop →
Licence plate W5W Shop →
Side marker W5W Shop →
Interior / map Festoon C5W 36 mm Shop →

Wiper blades

3
Driver side 24 in Shop →
Passenger side 24 in Shop →
Rear Not fitted No rear wiper on the 996 coupe or cabriolet. —

Battery

3
Group size Group 48 (H6) Confirm tray and terminal orientation before ordering — some cars were built with a taller case. Shop →
Minimum cold cranking amps 680 CCA —
Terminal layout Positive on the right, viewed from the front of the car —

Fluids and capacities

8 Capacities are approximate service fills, not dry-rebuild volumes.
Engine oil — capacity 8.7 qt (8.25 L) with filter ✓ Fill to the dipstick, not to the number — the M96 reads accurately only when warm and level. Dry fill is 12.5 L, which is not what you need for a service. —
Engine oil — specification 0W-40, Porsche A40 approved Shop →
Coolant — capacity 23.8 qt (22.5 L) ✓ Roughly 5.9 US gallons. —
Coolant — specification Porsche pink G40, phosphate-free Do not top up with universal green. Mixing chemistries in an aluminium and plastic system is a slow, expensive mistake. Shop →
Brake fluid DOT 4, low viscosity Shop →
Manual transmission 2.6 qt, 75W-90 GL-5 Shop →
Power steering Pentosin CHF 11S Shop →
Fuel tank 16.9 gal 23.7 gal on cars with the optional long-range tank. —

Wheels and tyres

5
Bolt pattern 5 x 130 mm
Centre bore 71.6 mm
Lug bolt thread M14 x 1.5
Tyre size — 18 in front 225/40 ZR18
Tyre size — 18 in rear (wide body) 295/30 ZR18

Torque values

4 Critical fasteners. Verify against factory documentation before relying on any of these.
Wheel lug bolts 96 lb-ft (130 Nm) ✓ All 996 variants. Star pattern, on the ground, calibrated wrench, and re-check after a short drive.
Engine oil drain plug 37 lb-ft (50 Nm) ✓ New crush washer every time.
Oil filter housing cap 25 Nm (18 lb-ft) ✓ The figure is moulded into the cap. Do not over-tighten into the aluminium housing.
Spark plugs 22 lb-ft (30 Nm) ✓ New plugs. Reused plugs go to 19 lb-ft (25 Nm). No anti-seize — Porsche prohibits it per technical bulletin 9102.

Fitment for the 2003 996.2 Carrera 4S. Torque values in particular are safety-relevant — verify against factory documentation rather than relying on this page alone.

Buying guide

7
  1. 01

    Borescope every cylinder

    The single most important line item in a 996 pre-purchase inspection. Bore scoring is invisible from the outside and is the difference between a $30k car and a $30k car that needs a $20k engine.

  2. 02

    Cut the oil filter open

    Ferrous glitter or bearing material in the pleats is a walk-away signal. Bring a filter cutter to the PPI or ask the shop to do it in front of you.

  3. 03

    Read the IMS history honestly

    A documented retrofit is a genuine value-add. "The previous owner said it was done" is not. Ask for the invoice with the part number.

  4. 04

    Consider a Mezger car

    Turbo, GT2 and GT3 sidestep the IMS and bore-scoring conversation entirely. They cost multiples more to buy and to service, but the engine anxiety disappears.

  5. 05

    Check the convertible top and Targa glass

    Cabriolet top motors and Targa roof mechanisms are expensive, slow to source and frequently deferred by sellers.

  6. 06

    Value the boring stuff

    Recent clutch, recent radiators, fresh suspension bushings and a thick folder of independent-specialist invoices are worth more than low miles and a detail job.

  7. 07

    Colors and options move the price

    Manual over Tiptronic, sport seats, and a color that is not silver or black all matter to the next buyer more than they should.

Parts and gear

25 Chosen for this car, not for the commission

What a Carrera 4S actually costs to keep, grouped by why you would buy it. Prices are typical US parts-only figures — labour is separate, and the DIY note says whether that matters. Where a link earns us a commission it costs you nothing and never changes what appears here.

Parts that fix a known problem on this car

9 Each one maps to an issue above
  • Engine $700–$1,900

    IMS bearing retrofit kit

    The actual fix for the failure described above. Upgraded ceramic-hybrid cartridges and pressure-fed solutions both exist; LN Engineering is the reference brand. Only certain bearing types are serviceable, so identify which one the engine has before ordering — and only fit it with the transmission already out for a clutch.

    FCP Euro → Shop job
  • Engine $180–$400

    Air–oil separator

    When the diaphragm tears and the car smokes like a two-stroke, this is the part. Cheap enough that many owners replace it on spec rather than diagnosing around it, and it is the single most common reason a 996 gets wrongly written off as having a dead engine.

    FCP Euro → DIY or shop
  • Cooling $500–$1,100

    Radiator and condenser pair

    Once the cores start weeping there is no repair. Replace radiators and the condensers behind them as a set while the bumper is off — doing one side, or doing radiators without condensers, means paying the same labour twice.

    FCP Euro → Shop job
  • Cooling $120–$260

    Coolant expansion tank

    The plastic tank goes brittle with heat cycles and splits, usually at the seam, usually without warning. Almost every 996 needs one eventually. Do it with the cap and the level sensor.

    FCP Euro → DIY or shop
  • Cooling $200–$480

    Water pump and thermostat

    The original plastic impeller degrades and can shed into the cooling system. Fit a pump with a metal or upgraded impeller and change the thermostat at the same time — the labour overlaps almost entirely.

    FCP Euro → DIY or shop
  • Electrical $40–$100

    Ignition switch

    A genuinely cheap part behind moderate labour, and the reason for a great many "dead 996" forum posts. Worth carrying the part before the failure strands you rather than after.

    FCP Euro → DIY or shop
  • Interior $50–$160

    Door handle repair kit

    The interior door pull mechanism is a known breakage. Repair kits and reinforced replacements cost a fraction of the factory assembly and fix it permanently.

    FCP Euro → DIY
  • Exterior $150–$450

    Headlight lens replacement

    The 996 lenses cloud and craze with age, which ages the whole car more than any other single thing. Replacement lenses restore the look without touching the housings or the aim.

    FCP Euro → DIY
  • Convertible $100–$280

    Convertible top cable and transmission kit

    The drive cables fray and the top jams part-open, which is how most 996 cabriolets end up with a deferred roof. The repair parts are cheap relative to a shop diagnosing it from scratch.

    FCP Euro → DIY or shop

Worth doing before it fails

6 Cheaper than the repair it avoids
  • Cooling $90–$200

    Radiator grille screens

    The reason the radiators above rot. Mesh inserts in the bumper ducts stop the leaf litter and grit that hold moisture against the cores. A hundred-dollar part guarding a two-thousand-dollar repair, and it fits in an afternoon with the bumper on.

    Shop this → DIY
  • Engine $110–$210

    Low-temperature thermostat

    Opens earlier and holds the engine meaningfully cooler in traffic and on track. Widely fitted on M96 cars by owners who would rather run cool than argue about whether it prevents bore scoring. Cheap, reversible, and it makes the temperature gauge tell you something.

    Shop this → DIY or shop
  • Engine $25–$60

    Magnetic drain plug

    Catches ferrous debris where you will actually see it, every oil change, for the price of a tank of fuel. Paired with a cut-open filter this is the cheapest engine-health monitoring that exists for an M96.

    Shop this → DIY
  • Ignition $250–$480

    Coil pack and spark plug set

    Six coils and six plugs. Coils fail on age rather than mileage, so replacing them as a set with the plugs turns a future roadside misfire into a scheduled afternoon.

    Shop this → DIY
  • Chassis $150–$400

    Engine and transmission mount set

    Twenty-year-old mounts sag and let the drivetrain move, which reads to the driver as vagueness and vibration rather than as a broken part. Replacing them restores the directness people buy these cars for.

    FCP Euro → DIY or shop
  • Chassis $300–$750

    Front control arm and bushing kit

    Tired bushings quietly ruin the steering feel that is the whole point of a hydraulically-steered 911. This is the single most transformative suspension spend on a high-mileage car, and it is invisible on a test drive until you drive a fresh one.

    FCP Euro → Shop job

Consumables you will rebuy

5 Ordinary running costs
  • Fluids $70–$140

    Porsche-approved engine oil

    The M96 is specific about weight and additive package, and this engine is not the place to save eight dollars. Roughly nine quarts a change, and on a shortened interval that is the most-repeated purchase a 996 owner makes.

    Shop this → DIY
  • Fluids $15–$45

    Oil filter and sump hardware

    Bought with every oil change, and the thing you cut open afterwards. Get the crush washers in the same order.

    Shop this → DIY
  • Fluids $30–$80

    Porsche-spec coolant

    The correct pink specification, not universal green. Mixing chemistries in an aluminium and plastic cooling system is a slow, expensive mistake.

    Shop this → DIY
  • Fluids $15–$60

    Brake fluid

    Two-year replacement, annual if the car sees track use. A high-temperature fluid is the cheapest brake upgrade there is.

    Shop this → DIY
  • Service $25–$70

    Cabin and engine air filters

    Both are ten-minute jobs that shops charge properly for. Buy them together with the oil.

    Shop this → DIY

Tools worth owning

5 Bought once, used for years
  • Diagnostics $250–$1,000

    Porsche-specific diagnostic interface

    A generic code reader sees a fraction of what a 996 stores. A Porsche-specific tool — Durametric is the long-standing owner choice — reads every module, shows actual fault history and lets you clear an airbag light without a dealer visit. It pays for itself on the second use.

    Shop this → DIY
  • Inspection $50–$220

    Borescope camera

    Lets you check cylinder walls through the plug holes before paying for a full inspection on a car you are unsure about. On a 3.6 this is the difference between a good buy and a $20,000 surprise.

    Shop this → DIY
  • Inspection $30–$80

    Oil filter cutter

    Opens the filter so you can spread the pleats and look for metal. The single cheapest early warning an M96 owner has, and it works for the life of the car.

    Shop this → DIY
  • Lifting $150–$420

    Low-profile jack and jack pads

    A standard trolley jack will not fit under the sill, and the jack points crush without a proper puck. Buy the pads with the jack — people always come back for them.

    Shop this → DIY
  • Storage $50–$130

    Battery tender

    These cars have a real parasitic draw and hate sitting. A flat battery can also scramble the alarm module, turning a dead battery into a diagnostic appointment.

    Shop this → DIY