Carbon build-up on intake valves (DFI)
usually 100,000–180,000 km · Wear part
Signs: Rough idle
Fix: Walnut blasting
€500–1,000
Common faults, service intervals and costs
Porsche 911 (997)
2004–2012
2
engines covered
9
known faults
18,216
roadworthiness tests in the statistics
12
official recalls
Enter your VIN and mileage and get a plan built for your exact engine and gearbox.
The Porsche 911 (997) was built from 2004 to 2012.
For this generation we cover 2 engines and 9 known faults, each with the mileage range where it usually appears.
The most expensive known risk is Bore scoring: it usually appears at 80,000–180,000 km and costs €8,000–20,000 to fix.
In UK roadworthiness tests in 2024, at 50–100 thousand km this model most often failed on: lights, wipers and visibility (4.4 %), tyres and wheels (2.3 %), exhaust, emissions and leaks (1.7 %). It fails less often than average on: brakes, suspension, tyres and wheels, lights, wipers and visibility, body and corrosion, exhaust, emissions and leaks.
Engines
| Engine | Fuel | Timing drive | Oil |
|---|---|---|---|
| 3.4 / 3.6 / 3.8 DFI flat-six (9A1) | Petrol | Chain | 0W-40 · Porsche A40 · ~8.5 L · every 15,000 km |
| 3.4 / 3.6 flat-six (M96/M97) | Petrol | Chain | 0W-40 / 5W-40 · Porsche A40 · ~8.5–10.0 L · every 15,000 km |
Faults by engine
3.4 / 3.6 / 3.8 DFI flat-six (9A1)
Water pump / thermostat
usually 80,000–140,000 km · Wear part
Signs: Coolant weep
Fix: Replace pump
€500–900
3.4 / 3.6 flat-six (M96/M97)
IMS bearing failure
usually 60,000–160,000 km · High risk
Signs: Metal in oil, rattle — can destroy the engine
Fix: Preventive IMS bearing retrofit
€1,500–3,500
Rear main seal (RMS) leak
usually 60,000–150,000 km · Wear part
Signs: Oil drip between engine and gearbox
Fix: Replace seal (with clutch)
€400–1,200
Bore scoring
usually 80,000–180,000 km · High risk
Signs: Oil consumption, ticking, sooty tailpipe on one bank
Fix: Borescope inspection; engine rebuild
€8,000–20,000
Coolant expansion tank crack
usually 60,000–140,000 km · Wear part
Signs: Coolant smell, drops
Fix: Replace tank
€200–400
Gearboxes
Manual
Clutch wear
usually 120,000–200,000 km · Medium risk
Signs: Slipping, high bite point
Fix: Replace clutch kit
€500–900
Tiptronic (Aisin / ZF)
Torque converter / valve body
usually 150,000–250,000 km · Wear part
Signs: Delayed or harsh shifts
Fix: Fluid service, repair
€300–2,500
PDK (7 / 8-speed, wet clutch)
DCT mechatronic / solenoids
usually 120,000–220,000 km · Medium risk
Signs: Harsh shifts
Fix: Repair; keep oil changes at 60,000 km
€800–2,000
Scheduled service
Intervals and typical prices for the 3.4 / 3.6 / 3.8 DFI flat-six (9A1) engine. Other engines differ in oil, timing drive and some filters; the app gives the exact plan.
| Item | Interval | Typical price |
|---|---|---|
| Engine oil + oil filterEngine | every 15,000 km or every 12 months | €70–150 |
| Cabin (pollen) filterClimate | every 15,000 km or every 12 months | €15–40 |
| Brake fluidBrakes | every 24 months | €50–95 |
| A/C service (regas + desiccant)Climate | every 24 months | €70–150 |
| Air filterEngine | every 30,000 km or every 24 months | €15–45 |
| Spark plugsIgnition | every 60,000 km or every 48 months | €50–160 |
| Auxiliary (serpentine) beltEngine | every 120,000 km | €70–180 |
| Coolant replacementCooling | every 150,000 km or every 96 months | €70–150 |
| Timing chain inspection (listen on cold start)Engine | every 150,000 km | €0–120 |
| Manual gearbox oilTransmission | every 150,000 km | €60–130 |
| Front brake padsBrakes | usually at 30,000–60,000 km | €60–150 |
| Front brake discs + padsBrakes | usually at 60,000–120,000 km | €150–320 |
| Rear brake padsBrakes | usually at 50,000–90,000 km | €50–130 |
| Tyres (set of 4)Wheels | usually at 40,000–60,000 km | €320–700 |
| Wiper bladesBody | checked at service | €20–50 |
| 12V batteryElectrical | checked at service | €100–220 |
Roadworthiness tests by mileage
Share of tests in the United Kingdom (DVSA MOT, 2024) that this model failed because of each system. Bold red means more often and green less often than an average car of the same age and mileage. Sample: 18,216 tests.
| thousand km | 0–50 | 50–100 | 100–150 | 150–200 |
|---|---|---|---|---|
| Brakes | 0.3 % | 1.4 % | 2.9 % | 4.6 % |
| Suspension | 0.3 % | 1.1 % | 2.4 % | 3.5 % |
| Steering | 0.0 % | 0.2 % | 0.8 % | 0.8 % |
| Tyres and wheels | 1.6 % | 2.3 % | 3.3 % | 4.3 % |
| Lights, wipers and visibility | 2.9 % | 4.4 % | 6.0 % | 8.8 % |
| Body and corrosion | 0.5 % | 1.5 % | 2.9 % | 2.5 % |
| Exhaust, emissions and leaks | 0.5 % | 1.7 % | 3.1 % | 5.1 % |
Most common engine versions in the EU
New cars of this generation registered in the EU, Iceland and Norway 2010–2025: 3,557, of which 0 in Croatia. The share shows how common each version is.
| Version | Share | Years | CO₂ | Fuel use |
|---|---|---|---|---|
| 3.4 / 3.6 / 3.8 DFI flat-six (9A1)3.8 (3,800 cm³) · Petrol | 87.0 % | 2010–2010 | — | — |
| 3.4 / 3.6 / 3.8 DFI flat-six (9A1)3.6 (3,600 cm³) · Petrol | 8.4 % | 2010–2010 | — | — |
| 3.4 / 3.6 / 3.8 DFI flat-six (9A1)3.6 (3,614 cm³) · Petrol | 4.2 % | 2010–2010 | — | — |
Source: European Environment Agency (EEA), monitoring of CO₂ emissions from new passenger cars, CC BY 4.0. CO₂ and fuel use are official type-approval values (WLTP from 2021), not real-world consumption.
Owner complaints in the US
Which systems owners reported to the US agency NHTSA and at what mileage. Complaints are not confirmed faults and some relate to recalls. Sample: 132 complaints.
Official recalls
Recalls the manufacturer published in the United Kingdom for this model (12). The same recalls usually apply across Europe. Ask an authorised dealer to check by VIN whether your car is affected and whether the work has been done.
- Fire risk Fire may occur01/05/2014 · R/2014/059
- Steering Tailpipe may become detached25/04/2013 · R/2013/032
- Steering Rear hub may detach10/12/2012 · R/2012/156
- Fire risk Risk of fire28/03/2012 · R/2012/040
- Wheels / tyres Wheel may detach09/05/2011 · R/2011/133
- Steering Engine spacers may detach01/01/2009 · R/2009/001
- Steering Steering could be impaired09/10/2008 · R/2008/145
- Suspension / axles Defective switch console12/12/2007 · R/2007/179
The other recalls (4) are listed in the app.
Common questions
Does the Porsche 911 (997) have a timing chain or a timing belt?
3.4 / 3.6 / 3.8 DFI flat-six (9A1): chain; 3.4 / 3.6 flat-six (M96/M97): chain.
What are the known problems with the Porsche 911 (997)?
The faults with the highest risk: bore scoring (80,000–180,000 km, €8,000–20,000); IMS bearing failure (60,000–160,000 km, €1,500–3,500); DCT mechatronic / solenoids (120,000–220,000 km, €800–2,000); clutch wear (120,000–200,000 km, €500–900). The full list by engine is on this page.
What does the Porsche 911 (997) most often fail its roadworthiness test on?
In UK roadworthiness tests in 2024, at 50–100 thousand km this model most often failed on: lights, wipers and visibility (4.4 %), tyres and wheels (2.3 %), exhaust, emissions and leaks (1.7 %). It fails less often than average on: brakes, suspension, tyres and wheels, lights, wipers and visibility, body and corrosion, exhaust, emissions and leaks.
What should you check when buying a used Porsche 911 (997)?
Before you buy, ask an authorised dealer to check by VIN that the recalls have been done (12 have been published for this model). On the test drive, watch for these signs: oil consumption, ticking, sooty tailpipe on one bank; metal in oil, rattle — can destroy the engine. The full checklist is in the guide to buying a used car.
Other generations
Porsche 911 (996) 1997–2005Porsche 911 (991.1) 2011–2016Porsche 911 (991.2) 2016–2019Porsche 911 (992) 2019–Porsche 718 Boxster / Cayman (981 / 982) 2012–
Models with the same engines
These models share engines with this car, so they share some of its faults too.
Other Porsche models
Porsche Cayenne (955 / 957) 2002–2010Porsche Panamera 2009–Porsche Cayenne (958 / 9Y0) 2010–
Sources and notes
Faults, intervals and prices are indicative and collected from public sources and owner experience; always rely on the service book and a qualified workshop. Test statistics: DVSA – Anonymised MOT tests and results, Open Government Licence v3.0. Dutch tests: RDW Open Data (CC0). Engine versions: EEA, monitoring of CO₂ emissions from new passenger cars (CC BY 4.0, DG CLIMA). Owner complaints: NHTSA ODI (public domain). Recalls: DVSA Vehicle Safety Branch Recalls Database, OGL v3.0. Brand and model names are trademarks of their owners and are used only to describe the vehicles.
Updated 08/10/2026