The 1999 Porsche 911 Carrera, part of the 996 generation, marked a significant shift for the iconic sports car. It introduced water-cooled engines and a more modern design. If you own one, keeping it in top condition requires knowing where to find the right parts. This guide covers the most common parts you’ll need, whether for maintenance, repair, or performance upgrades, and helps you decide between OEM and aftermarket options.
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Engine and Performance Parts
The 1999 911 Carrera uses the M96.01 engine, a 3.4-liter flat-six producing 296 horsepower. It’s known for its reliability when maintained properly, but certain parts are prone to wear.
IMS Bearing and RMS
The intermediate shaft (IMS) bearing is a well-known weak point. Upgrading to a ceramic hybrid bearing is highly recommended to prevent catastrophic engine failure. Many owners also replace the rear main seal (RMS) at the same time. Aftermarket kits from LN Engineering or Pelican Parts are popular, but you can also use OEM Porsche parts. Cost: $200-$700 depending on the kit.
Timing Chain and Tensioners
The timing chain system generally lasts a long time, but the tensioners can wear. If you hear a rattling noise from the front of the engine, replace the tensioners and guides. OEM tensioners are robust, but aftermarket options like IMS Solutions also work well.
Air Oil Separator (AOS)
The AOS can fail, causing smoke from the exhaust. Replace with an updated OEM unit or an aftermarket billet version. The job is labor-intensive but straightforward.
Ignition Coils and Spark Plugs
Use OEM Bosch coils or high-quality aftermarket like Beru. Spark plugs should be Bosch or NGK, replaced every 30,000 miles. Always gap them to spec.
Fuel Pump and Injectors
The fuel pump can fail after 100,000 miles. Aftermarket pumps from Bosch or Airtex are fine. For injectors, stick to OEM or Bosch replacements.
Suspension and Brakes
The 996’s suspension is a blend of comfort and performance, but bushings and shocks wear over time.
Shocks and Struts
Bilstein and Koni offer excellent aftermarket shocks. If you want OEM ride quality, Sachs or Boge are the original suppliers. Coilover kits from KW or H&R are popular for lowering and sharpening handling.
Control Arms and Bushings
Front and rear control arms often need replacement due to ball joint wear. Aftermarket arms from Lemforder or Meyle are high-quality. Polyurethane bushings from Powerflex or Elephant Racing improve feel but add some vibration.
Brake Pads and Rotors
For street use, OEM Brembo pads and rotors work well. For track days, consider Pagid or Performance Friction pads. Cross-drilled or slotted rotors from Zimmerman or ATE are common upgrades.
Sway Bars
Thicker sway bars reduce body roll. H&R, Eibach, and RennTech make good options. Install with upgraded drop links.
Interior and Exterior
Keeping the car looking good requires sourcing trim and cosmetic parts.
Climate Control and Radio
The HVAC panel can develop stuck buttons or backlight failure. Replace with a rebuilt unit or upgrade to a modern touchscreen stereo with Apple CarPlay. Many kits from Dynavin or Pioneer fit with adapters.
Headlights and Taillights
The factory headlights can yellow. Replace with OEM or aftermarket units like Depo or Spyder. LEDs are a popular upgrade for better visibility.
Door Handles and Window Regulators
Door handles break easily. Use OEM parts reinforced with a metal backing. Window regulators fail frequently; aftermarket replacements from Cardone or ACI work well.
Seats and Carpet
Seat cores can sag. Rebuild kits from Classic 9 Leather offer new foam and leather. Floor mats from Lloyd or Porsche Parts are direct fit.
Maintenance and Service Parts
Regular maintenance is crucial for a 1999 911.
Oil and Filters
Use Mobil 1 0W-40 or Liqui Moly 5W-40. Oil filters from Mann or Mahle are OEM quality. The oil change interval should be 5,000-7,500 miles.
Serpentine Belt and Pulleys
Replace the belt every 30,000 miles. Gates makes a good belt. Idler pulleys and tensioners from OEM or Gates.
Coolant System
The coolant expansion tank can crack. Upgrade to an aluminum tank from aftermarket vendors. Use Porsche-approved coolant.
Transmission and Clutch
Manual transmission: use OEM clutch kits from Sachs or LUK. For automatic (Tiptronic), service fluid every 60,000 miles. ZF or OEM filters.
Drive Belt Tensioner
A common failure point. Replace with an aftermarket assembly from a reputable brand.
Where to Buy Parts
For OEM parts, dealerships are reliable but expensive. Online retailers like Pelican Parts, FCP Euro, Suncoast Porsche, and AutohausAZ offer competitive prices and fast shipping. For rare or hard-to-find items, specialty sites like 996 Parts or Rennsport Systems are helpful. Avoid generic no-name brands for critical components.
Final Recommendation
Focus on the IMS bearing, AOS, cooling system, and suspension bushings as priorities. For daily driving, OEM or high-quality aftermarket parts from trusted brands (Bosch, Sachs, Lemforder, Bilstein) provide the best balance of reliability and cost. Avoid low-priced parts for safety-critical items. Keep records of all repairs to maintain value. With proper care, your 1999 911 Carrera will reward you with miles of driving joy.