The 997.1 generation 911 Carrera with the 3.6L M96/M97 engine is a fantastic driver's car plagued by catastrophic engine failure risks. The IMS bearing and bore scoring issues make this era's flat-six a ticking time bomb that can grenade without warning, overshadowing otherwise solid mechanicals.
Intermediate Shaft (IMS) Bearing Failure
Occasional · high severity
Symptoms: metallic grinding or knocking from engine, metal shavings in oil filter, catastrophic engine seizure with no warning in many cases, check engine light may or may not appear before failure
Fix: Requires complete engine removal and disassembly to replace IMS bearing (8-12 hours labor), but most owners discover this after catastrophic failure requiring full engine rebuild or replacement. Preventive replacement during clutch jobs is common. Many opt for LN Engineering or Flat 6 Innovations upgraded bearings.
Estimated cost: $2,500-4,000 preventive replacement; $15,000-25,000 after failure with rebuild
Cylinder Bore Scoring and Piston/Cylinder Failure
Occasional · high severity
Typical onset: 60,000-90,000 mi
Symptoms: excessive oil consumption (more than 1 qt per 1,000 mi), blue smoke on cold starts, rough idle and misfires, loss of compression on one or more cylinders, metallic rattling at startup
Fix: Cylinder walls score due to inadequate lubrication and Lokasil coating breakdown. Requires complete engine disassembly, re-sleeving or replacement of all cylinders, new pistons and rings (40-60 hours labor). Some engines are beyond repair and need replacement.
Estimated cost: $18,000-28,000 for rebuild; $12,000-18,000 for used engine swap
Rear Main Seal (RMS) Oil Leak
Common · medium severity
Typical onset: 50,000-80,000 mi
Symptoms: oil pooling under rear of engine, oil spots on garage floor after parking, low oil level between changes, oil coating on clutch in manual cars can cause slipping
Fix: Seal deteriorates and leaks oil between engine and transmission. Requires transmission and clutch removal to access (12-16 hours labor). Always replace clutch and IMS bearing at same time if not already done since you're in there.
Estimated cost: $2,000-3,500 seal only; $4,500-7,000 with clutch and IMS bearing
Coolant Expansion Tank Cracking
Common · medium severity
Typical onset: 70,000-100,000 mi
Symptoms: coolant smell in cabin or engine bay, coolant dripping visible near left rear of engine compartment, low coolant warning light, overheating in severe cases
Fix: Plastic tank becomes brittle and cracks at mounting points or seams. Relatively straightforward replacement (1.5-2.5 hours labor) but requires removing engine cover and draining system. Use OEM or high-quality aftermarket to avoid repeat failures.
Estimated cost: $400-700
Transmission Oil Cooler Line Leaks
Common · low severity
Typical onset: 80,000-120,000 mi
Symptoms: transmission fluid spots under car, low transmission fluid level, harsh shifting if fluid gets very low, visible fluid on cooler lines or connections
Fix: Cooler lines and connections age and seep, especially on Tiptronic cars. Lines can be replaced individually or cooler assembly as a unit (2-4 hours labor depending on extent). Catch early before low fluid damages transmission.
Estimated cost: $500-1,200
Control Arm Bushings and Ball Joint Wear
Common · medium severity
Typical onset: 60,000-90,000 mi
Symptoms: clunking over bumps from front or rear, wandering or imprecise steering feel, uneven tire wear, failed alignment or won't hold alignment, popping noise during turning
Fix: Suspension bushings wear out and ball joints develop play, particularly front lower control arms and rear trailing arm bushings. Plan on replacing multiple arms at once (4-8 hours labor depending on how many need replacement). OEM parts recommended for proper handling.
Estimated cost: $1,500-3,000 for typical multi-arm refresh
Fuel Sender Unit Failure
Occasional · low severity
Symptoms: inaccurate fuel gauge reading, gauge stuck on full or empty, erratic gauge movement, fuel range display incorrect or missing
Fix: Fuel level sender develops bad connections or internal failures. Requires fuel tank removal or dropping (3-5 hours labor). Not a breakdown issue but annoying and can lead to running out of gas if you trust the gauge.
Estimated cost: $800-1,400
Owner tips
Do pre-purchase borescope inspection of cylinders and oil analysis to check for bore scoring before buying — this is non-negotiable
IMS bearing preventive replacement during any clutch job is cheap insurance on cars without documented replacement
Keep meticulous oil change records at 5,000 mi intervals with high-quality 0W-40 oil — critical for preventing bore scoring
Budget $2,000-3,000/year for maintenance and repairs beyond the engine grenades, which are always looming
Extended warranties that specifically cover IMS and bore scoring (rare but exist) are worth their weight in gold
Only buy if IMS bearing already replaced and borescope shows clean cylinders, or if you have $20k set aside for an eventual engine rebuild — otherwise this is a financial hand grenade.
AI-assisted summary drawn from NHTSA recall data, our labor-times database, and platform knowledge. Not a substitute for a pre-purchase inspection on a specific vehicle.
Fitment notes: Battery located in front trunk (frunk); AGM type required for proper vehicle operation
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Every control module on the 2005-2007 Porsche 911 Carrera — where it lives, replacement time, and what it takes to program a replacement. Modules marked dealer / factory tool won't work after a part swap alone — budget for programming.
Anti-lock Brake System Control Unit (includes PSM) (ABS/PSM)1.6 hr R&Rdealer / factory tool +0.5 hr▸ programming details
Park Assist Control Unit (optional) (ParkAssist)1.0 hr R&Raftermarket tool +0.3 hr▸ programming details
📍 Rear trunk area, near bumper
🔧 Durametric or PIWIS I
⚠️ Only on vehicles with parking sensors; sensor calibration may be needed
Transmission Control Unit (Tiptronic only) (TCU)0.9 hr R&Rdealer / factory tool +0.6 hr▸ programming details
📍 Under driver's seat
🔧 Porsche PIWIS I or PIWIS II
⚠️ Only on Tiptronic models; adaptation and shift point learning required
Seat Memory Control Unit (optional) (Seat Memory)0.8 hr R&Rrelearn only +0.1 hr▸ programming details
📍 Under driver's seat
🔧 Manual relearn via seat controls
⚠️ Only on vehicles with memory seat option; positions must be reprogrammed
Aftermarket tool coverage varies by software version and vehicle build — treat "aftermarket tool" rows as "usually possible" and verify against your tool maker's coverage list before promising a customer. Spot a wrong location or hour? Tell us — corrections ship fast here.
Ohlins USA, Inc (Ohlins) is recalling certain Front Struts, part number POS 5N20. These struts were sold as part of Ohlins strut kits part number POZ MN02, intended for installation on 1999-2005 Porsche 911 Carrera 4 and 4S (generation 996), and 2001-2006 Porsche 911 Turbo / Turbo S (generation 996) and kit part number POZ MN05, intended for installation on 2005-2012 Porsche 911 Carrera 4 and 4S (generation 997), and 2006-2013 Porsche 911 Turbo / Turbo S (generation 997). The pin of the strut may experience excessive stress during maximum steering, possibly resulting breakage of the pin.
Consequence: If the pin fails, it will cause separation of the strut from the vehicle, affecting vehicle control and increasing the risk of a crash.
Remedy: Ohlins will notify owners, and dealers will request the return of all unsold kits containing the subject part from dealer/distributor inventory for a full refund. All owners who purchased one of the kits (POZ MN02 or POZ MN05) will receive replacement front struts (POS 5N20 or POS 5N21 - These parts are interchangeable), along with new top mount interface solutions, free of charge. The recall began December 22, 2020. Owners may contact Ohlins customer service at 1-800-336-9029.
Performance
Horsepower
325hp
Torque
273lb-ft
0–60 mph
4.8sec
Quarter mile
13.3sec
Top speed
177mph
Capability & size
Curb weight
3,075lb
Wiper blades
997 generation (2005-2012). Porsche 911 coupes have no rear wiper. Both blades are typically equal length.
Size-standard part numbers — verify your connector type before buying. Rear blades are model-specific; check the package's vehicle list.
Fuel economy figures are EPA data via fueleconomy.gov (median across matching trims). Performance figures are compiled estimates for the 2006 Porsche 911 Carrera 3.6L H6 and can vary by trim.
🔧 Database maintained under the daily editorial review of Chris Hackleman · Master Technician · 20+ years and Jeff Moore · Master Lexus & Toyota Mechanic · 20+ years.